Update docs (#219)

* Add stale bot

* Update pull request template

* Update contributing section in README.md

Author: siriak

.github/pull_request_template.md

@@ -1,9 +1,12 @@
-Please include a summary of the change. Please also include relevant motivation and context (if applicable).
+Please include a summary of the change.
+Please also include relevant motivation and context (if applicable).
+Put 'x' in between square brackets to mark an item as complete.
 
 - [ ] I have performed a self-review of my code
 - [ ] My code follows the style guidelines of this project
-- [ ] I have added comments to hard-to-understand areas of my code
 - [ ] I have added tests that prove my fix is effective or that my feature works
 - [ ] New and existing unit tests pass locally with my changes
-- [ ] I have made corresponding changes to the comments
+- [ ] Comments in areas I changed are up to date
+- [ ] I have added comments to hard-to-understand areas of my code
 - [ ] I have made corresponding changes to the README.md
+- [ ] I have made corresponding changes to the DIRECTORY.md

.github/stale.yml

@@ -0,0 +1,62 @@
+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an Issue or Pull Request becomes stale
+daysUntilStale: 30
+
+# Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
+# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
+daysUntilClose: 7
+
+# Only issues or pull requests with all of these labels are check if stale. Defaults to `[]` (disabled)
+onlyLabels: []
+
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - "dont-close"
+
+# Set to true to ignore issues in a project (defaults to false)
+exemptProjects: false
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: false
+
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: false
+
+# Label to use when marking as stale
+staleLabel: abandoned
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 1
+
+# Comment to post when removing the stale label.
+# unmarkComment: >
+#   Your comment here.
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+pulls:
+  # Comment to post when marking as stale. Set to `false` to disable
+  markComment: >
+    This pull request has been automatically marked as abandoned because it has not had
+    recent activity. It will be closed if no further activity occurs. Thank you
+    for your contributions.
+
+  # Comment to post when closing a stale Pull Request.
+  closeComment: >
+    Please ping one of the maintainers once you commit the changes requested
+    or make improvements on the code. If this is not the case and you need
+    some help, feel free to ask for help in our [Gitter](https://gitter.im/TheAlgorithms)
+    channel. Thank you for your contributions!
+
+issues:
+  # Comment to post when marking as stale. Set to `false` to disable
+  markComment: >
+    This issue has been automatically marked as abandoned because it has not had
+    recent activity. It will be closed if no further activity occurs. Thank you
+    for your contributions.
+
+  # Comment to post when closing a stale Issue.
+  closeComment: >
+    Please ping one of the maintainers once you add more information and updates here.
+    If this is not the case and you need some help, feel free to ask for help
+    in our [Gitter](https://gitter.im/TheAlgorithms) channel. Thank you for your contributions!

README.md

@@ -6,8 +6,6 @@
 
 This repository contains algorithms and data structures implemented in C# for eductional purposes.  
 
----
-
 ## Overview  
 * [Algorithms](./Algorithms/)
 	* [Data Compression](<./Algorithms/DataCompression>)
@@ -125,8 +123,10 @@ This repository contains algorithms and data structures implemented in C# for ed
 	* [Linked List](./DataStructures/LinkedList)
 		* [Singly Linked List](./DataStructures/LinkedList/SinglyLinkedList/SinglyLinkedList.cs)
 		* [Doubly Linked List](./DataStructures/LinkedList/DoublyLinkedList/DoublyLinkedList.cs)
----
 
-## Contribution
+## Contributing
 
-You can contribute with pleasure to this repository. Please orient on the directory structure and overall code style of this repository. If you want to ask a question or suggest something, please open an issue.
+You can contribute with pleasure to this repository.
+Please orient on the directory structure and overall code style of this repository
+and refer to [our contributing guidelines](./CONTRIBUTING.md) for more detail.
+If you want to ask a question or suggest something, please open an issue.