Adding CONTRIBUTING.md and Open Code of Conduct.

Author: gfosco

CONTRIBUTING.md

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+### Contributing to Parse Server
+
+#### Pull Requests Welcome!
+
+We really want Parse to be yours, to see it grow and thrive in the open source community.  
+
+##### Please Do's
+
+* Please write tests to cover new methods.
+* Please run the tests and make sure you didn't break anything.
+
+##### Code of Conduct
+
+This project adheres to the [Open Code of Conduct][code-of-conduct]. By participating, you are expected to honor this code.
+[code-of-conduct]: http://todogroup.org/opencodeofconduct/#Parse Server/fjm@fb.com
+
+