Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest to contribute to Peer Calls. By participating in
+this project, you agree to abide by the [code of conduct].
+
+  [code of conduct]: CODE_OF_CONDUCT.md
+
+Everyone is expected to follow the code of conduct anywhere in the project
+codebases, issue trackers and chatrooms.
+
+## Notice
+
+Before contributing, check the issue tracker and see if there is already an
+issue about something you're trying to implement. Check if somebody else is
+already assigned to the issue. It is recommended to *ask* or create an issue
+before implementing changes because this way you'll have a lower chance that
+your pull request will be rejected.
+
+## Contributing Code
+
+- Fork the repo
+
+- Install dependencies
+
+```
+npm install
+```
+
+- Make sure the tests pass:
+
+```
+npm test
+```
+
+- Make your change, with new passing tests. Follow the [style guide][style].
+
+  [style]: STYLE_GUIDE.md
+
+- Push to your fork. Write a [good commit message][commit]. Submit a pull request.
+
+  [commit]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+
+Others will give constructive feedback.  This is a time for discussion and
+improvements, and making the necessary changes will be required before we can
+merge the contribution.
+
+## License
+
+As the project uses the MIT license, you agree that any code you submit to the
+project will also be licensed under the same license.