Added a temporary CONTRIBUTIONS.md

Author: Chman

CONTRIBUTIONS.md

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+# Contributions
+
+## If you are interested in contributing, here are some ground rules:
+* Follow naming & style conventions in the project
+* Pull requests must be made against `v2` (not stable, which is the default)
+
+## All contributions are subject to the [Unity Contribution Agreement(UCA)](https://unity3d.com/legal/licenses/Unity_Contribution_Agreement)
+By making a pull request, you are confirming agreement to the terms and conditions of the UCA, including that your Contributions are your original creation and that you have complete right and authority to make your Contributions.
+
+## Once you have a change ready following these ground rules. Simply make a pull request in Github