Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -8,6 +8,15 @@ The following is a set of guidelines for contributing to Inpad.
 These are just guidelines, not rules, use your best judgment and feel free to
 propose changes to this document in a pull request.
 
+## Issue Labels
+
+Name               | Description
+-------------------|------------------------------
+stage-0: Proposal  | On Estimating its own needs
+stage-1: Draft     | On Designing how to implement
+stage-2: Candidate | Work in progress
+stage-3: Finished  | Ready to ship
+
 ## Submitting Issues
 
 * You can create an issue [here](https://github.com/sarah-seo/inpad/issues/new),
@@ -26,7 +35,7 @@ possible with your report. If you can, please include:
 ## Submitting Pull Requests
 
 * Include screenshots and animated GIFs in your pull request whenever possible.
-* Follow the JavaScript [coding style defined in docs](./docs/coding-style.md).
+* Follow the JavaScript [coding style defined in docs](./docs/development/coding-style.md).
 
 ## Git Commit Messages