docs: add LICENSE and community files

Adds MIT license (Lorenzo Longiave), contributing guide, GitHub issue
templates (bug report + feature request), and PR template.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: TheSmallPixel

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something isn't working as expected
+title: ''
+labels: bug
+---
+
+**Describe the bug**
+A clear description of what's wrong.
+
+**Reproduce**
+1. ...
+2. ...
+
+**Expected behavior**
+What you expected to happen.
+
+**Environment**
+- .NET version:
+- Action version (tag or commit):
+- Runner OS:
+
+**Workflow snippet**
+```yaml
+# the `with:` block you used
+```
+
+**Additional context**
+Logs, screenshots of the rendered graph, links.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea
+title: ''
+labels: enhancement
+---
+
+**The problem**
+What pain are you hitting today?
+
+**Proposed solution**
+What would you like to see?
+
+**Alternatives considered**
+Other approaches you've thought about.

.github/PULL_REQUEST_TEMPLATE.md

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+## What
+
+<!-- One-line summary of the change -->
+
+## Why
+
+<!-- Motivation: bug fixed, feature added, refactor reasoning -->
+
+## Checklist
+
+- [ ] Tests added or updated
+- [ ] `dotnet build` and `dotnet test` pass locally
+- [ ] `CHANGELOG.md` updated under `[Unreleased]` if user-visible
+- [ ] No tracked artifacts (`bin/`, `obj/`, `.DS_Store`, editor backups)

CONTRIBUTING.md

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+# Contributing
+
+Thanks for taking the time. PRs and issues are welcome.
+
+## Setup
+
+You need the [.NET 8 SDK](https://dotnet.microsoft.com/download).
+
+```bash
+git clone https://github.com/TheSmallPixel/GraphCSharp
+cd GraphCSharp
+dotnet build tools/CodeAnalysisTool
+dotnet test  tools/CodeAnalysisTool.Tests
+```
+
+## Running locally
+
+The analyzer is a standalone CLI:
+
+```bash
+dotnet run --project tools/CodeAnalysisTool -- <source-path> <docs-dir>
+```
+
+Open `<docs-dir>/index.html` in a browser to view the graph.
+
+## Pull requests
+
+- Keep changes focused — one concern per PR.
+- Add or update a test in `tools/CodeAnalysisTool.Tests` for any behavior change.
+- Run `dotnet test` locally before pushing.
+- Conventional prefixes (`fix:`, `feat:`, `docs:`, `refactor:`, `test:`, `chore:`) are appreciated.
+
+## Reporting bugs
+
+Use the [bug report template](.github/ISSUE_TEMPLATE/bug_report.md). Include
+the .NET version, the action invocation, and a minimal repro if possible.
+
+## Code of conduct
+
+This project follows the [Contributor Covenant](CODE_OF_CONDUCT.md).

LICENSE

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+MIT License
+
+Copyright (c) 2026 Lorenzo Longiave
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.