📝 Add contributing docs.

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [INSERT EMAIL ADDRESS]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

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+# Contributing to Compensation Calculator
+
+Thanks for wanting to contribute to the Compensation Calculator project!
+
+The following guidelines should help direct you in performing your contribution. Whether you want to submit a bug report or add a new feature, this document should help you to help this project.
+
+#### Table Of Contents
+
+[Code of Conduct](#code-of-conduct)
+
+[How Can I Contribute?](#how-can-i-contribute)
+  * [Reporting Bugs](#reporting-bugs)
+  * [Suggesting Enhancements](#suggesting-enhancements)
+  * [Your First Code Contribution](#your-first-code-contribution)
+  * [Pull Requests](#pull-requests)
+
+[Styleguides](#styleguides)
+  * [Git Commit Messages](#git-commit-messages)
+  * [JavaScript Styleguide](#javascript-styleguide)
+
+[Attribution](#attribution)
+
+## Code of Conduct
+
+This project and everyone participating in it is governed by the [Compensation Calculator Code of Conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+This section guides you through submitting a bug report for Compensation Calculator. Following these guidelines helps maintainers and the community understand your report :pencil:, reproduce the behavior :computer: :computer:, and find related reports :mag_right:.
+
+Before creating bug reports, please check [this list](#before-submitting-a-bug-report) as you might find out that you don't need to create one. When you are creating a bug report, please [include as many details as possible](#how-do-i-submit-a-good-bug-report). Fill out [the required template](ISSUE_TEMPLATE.md), the information it asks for helps us resolve issues faster.
+
+> **Note:** If you find a **Closed** issue that seems like it is the same thing that you're experiencing, open a new issue and include a link to the original issue in the body of your new one.
+
+#### Before Submitting A Bug Report
+
+* **Perform a [cursory search](https://github.com/pajama-programming/compensation-calculator/search?q=&type=Issues)** to see if the problem has already been reported. If it has **and the issue is still open**, add a comment to the existing issue instead of opening a new one.
+
+#### How Do I Submit A (Good) Bug Report?
+
+Bugs are tracked as [GitHub issues](https://guides.github.com/features/issues/). After you've determined it is a new bug, create an issue on the repository and provide the following information by filling in [the template](ISSUE_TEMPLATE.md).
+
+Explain the problem and include additional details to help maintainers reproduce the problem:
+
+* **Use a clear and descriptive title** for the issue to identify the problem.
+* **Describe the exact steps which reproduce the problem** in as many details as possible. For example, start by explaining how you started Compensation Calculator, e.g. which command exactly you used in the terminal, or how you started Compensation Calculator otherwise. When listing steps, **don't just say what you did, but explain how you did it**. For example, if you moved the cursor to the end of a line, explain if you used the mouse, or a keyboard shortcut or an Compensation Calculator command, and if so which one?
+* **Provide specific examples to demonstrate the steps**. Include links to files or GitHub projects, or copy/pasteable snippets, which you use in those examples. If you're providing snippets in the issue, use [Markdown code blocks](https://help.github.com/articles/markdown-basics/#multiple-lines).
+* **Describe the behavior you observed after following the steps** and point out what exactly is the problem with that behavior.
+* **Explain which behavior you expected to see instead and why.**
+* **Include screenshots and animated GIFs** which show you following the described steps and clearly demonstrate the problem. You can use [this tool](https://www.cockos.com/licecap/) to record GIFs on macOS and Windows, and [this tool](https://github.com/colinkeenan/silentcast) or [this tool](https://github.com/GNOME/byzanz) on Linux.
+* **If the problem wasn't triggered by a specific action**, describe what you were doing before the problem happened and share more information using the guidelines below.
+
+Include details about your configuration and environment:
+
+* **What's the name and version of the Web Browser you're using**?
+* **What's the name and version of the OS you're using**?
+
+### Suggesting Enhancements
+
+This section guides you through submitting an enhancement suggestion for the Compensation Calculator, including completely new features and minor improvements to existing functionality. Following these guidelines helps maintainers and the community understand your suggestion :pencil: and find related suggestions :mag_right:.
+
+Before creating enhancement suggestions, please check [this list](#before-submitting-an-enhancement-suggestion) as you might find out that you don't need to create one. When you are creating an enhancement suggestion, please [include as many details as possible](#how-do-i-submit-a-good-enhancement-suggestion). Fill in [the template](ISSUE_TEMPLATE.md), including the steps that you imagine you would take if the feature you're requesting existed.
+
+#### Before Submitting An Enhancement Suggestion
+
+* **Perform a [cursory search](https://github.com/pajama-programming/compensation-calculator/search?q=&type=Issues)** to see if the enhancement has already been suggested. If it has, add a comment to the existing issue instead of opening a new one.
+
+#### How Do I Submit A (Good) Enhancement Suggestion?
+
+Enhancement suggestions are tracked as [GitHub issues](https://guides.github.com/features/issues/). After you've determined it is a new enhancement, create an issue on that repository and provide the following information:
+
+* **Use a clear and descriptive title** for the issue to identify the suggestion.
+* **Provide a step-by-step description of the suggested enhancement** in as many details as possible.
+* **Provide specific examples to demonstrate the steps**. Include copy/pasteable snippets which you use in those examples, as [Markdown code blocks](https://help.github.com/articles/markdown-basics/#multiple-lines).
+* **Describe the current behavior** and **explain which behavior you expected to see instead** and why.
+* **Include screenshots and animated GIFs** which help you demonstrate the steps or point out the part of Compensation Calculator which the suggestion is related to. You can use [this tool](https://www.cockos.com/licecap/) to record GIFs on macOS and Windows, and [this tool](https://github.com/colinkeenan/silentcast) or [this tool](https://github.com/GNOME/byzanz) on Linux.
+* **Explain why this enhancement would be useful** to most Compensation Calculator users.
+* **Specify the name and version of the web browser you're using.**
+* **Specify the name and version of the OS you're using.**
+
+### Your First Code Contribution
+
+#### Local development
+
+Compensation Calculator can be developed locally. Following are instructions on how to develop:
+
+* [Install Node.js and npm](https://docs.npmjs.com/getting-started/installing-node#installing-npm-from-the-nodejs-site)
+* [Fork & Clone this repository onto your development computer](https://help.github.com/articles/fork-a-repo/)
+* Run `npm install` in root folder.
+* Begin development! You can run the web server using `npm start`.
+* Before submitting the pull request, check the following commands:
+    * `npm test` - This will run `mocha` for all tests. Make sure they stay passing!
+    * `npm run lint` - This will run `eslint` to check all `.js` files. This helps with having a consistent style.
+
+### Pull Requests
+
+The process described here has several goals:
+
+- Maintain Compensation Calculator's quality
+- Fix problems that are important to users
+- Engage the community in working toward the best possible Atom
+- Enable a sustainable system for Compensation Calculator's maintainers to review contributions
+
+Please follow these steps to have your contribution considered by the maintainers:
+
+1. Follow the [styleguides](#styleguides)
+2. After you submit your pull request, verify that all [status checks](https://help.github.com/articles/about-status-checks/) are passing <details><summary>What if the status checks are failing?</summary>If a status check is failing, and you believe that the failure is unrelated to your change, please leave a comment on the pull request explaining why you believe the failure is unrelated. A maintainer will re-run the status check for you. If we conclude that the failure was a false positive, then we will open an issue to track that problem with our status check suite.</details>
+
+While the prerequisites above must be satisfied prior to having your pull request reviewed, the reviewer(s) may ask you to complete additional design work, tests, or other changes before your pull request can be ultimately accepted.
+
+## Styleguides
+
+### Git Commit Messages
+
+* Use the present tense ("Add feature" not "Added feature")
+* Use the imperative mood ("Move cursor to..." not "Moves cursor to...")
+* Limit the first line to 72 characters or less
+* Reference issues and pull requests liberally after the first line
+* When only changing documentation, include `[ci skip]` in the commit title
+* Consider starting the commit message with an applicable emoji:
+    * :art: `:art:` when improving the format/structure of the code
+    * :racehorse: `:racehorse:` when improving performance
+    * :non-potable_water: `:non-potable_water:` when plugging memory leaks
+    * :memo: `:memo:` when writing docs
+    * :penguin: `:penguin:` when fixing something on Linux
+    * :apple: `:apple:` when fixing something on macOS
+    * :checkered_flag: `:checkered_flag:` when fixing something on Windows
+    * :bug: `:bug:` when fixing a bug
+    * :fire: `:fire:` when removing code or files
+    * :green_heart: `:green_heart:` when fixing the CI build
+    * :white_check_mark: `:white_check_mark:` when adding tests
+    * :lock: `:lock:` when dealing with security
+    * :arrow_up: `:arrow_up:` when upgrading dependencies
+    * :arrow_down: `:arrow_down:` when downgrading dependencies
+    * :shirt: `:shirt:` when removing linter warnings
+
+### JavaScript Styleguide
+
+All JavaScript must adhere to [JavaScript Standard Style](https://standardjs.com/).
+
+* Prefer the object spread operator (`{...anotherObj}`) to `Object.assign()`
+* Inline `export`s with expressions whenever possible
+  ```js
+  // Use this:
+  export default class ClassName {
+
+  }
+
+  // Instead of:
+  class ClassName {
+
+  }
+  export default ClassName
+  ```
+* Place requires in the following order:
+    * Built in Node Modules (such as `path`)
+    * Local Modules (using relative paths)
+* Place class properties in the following order:
+    * Class methods and properties (methods starting with `static`)
+    * Instance methods and properties
+* [Avoid platform-dependent code](https://flight-manual.atom.io/hacking-atom/sections/cross-platform-compatibility/)
+
+## Attribution
+
+This Contribution guide was adapted from [Atom's CONTRIBUTING guide](https://github.com/atom/atom/blob/master/CONTRIBUTING.md)

ISSUE_TEMPLATE.md

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+<!--
+
+Have you read Compensation Calculator's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/pajama-programming/compensation-calculator/blob/master/CODE_OF_CONDUCT.md
+
+-->
+
+###
+
+* [ ] Put an X between the brackets on this line if you have done all of the following:
+    * Checked that your issue isn't already filed: https://github.com/pajama-programming/compensation-calculator/search?q=&type=Issues
+
+### Description
+
+[Description of the issue]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+**Reproduces how often:** [What percentage of the time does it reproduce?]
+
+### Versions
+
+Please include the web browser and what version of the web browser you're running. Also, please include the OS and what version of the OS you're running.
+
+### Additional Information
+
+Any additional information, configuration or data that might be necessary to reproduce the issue.