Merge pull request #2 from npr/contributing

Create CONTRIBUTING.md

CONTRIBUTING.md

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+If you would like to contribute to this project, please start by visiting https://github.com/npr/RAD-Android for Android and https://github.com/npr/RAD-iOS for iOS. 
+
+To directly contribute to the development and extension of Remote Audio Data, you can:
+  * Issue a bug report (always appreciated).
+  * Submit a feature request.
+  * Or, show the community a new or different implementation or these RAD frameworks. How?
+    * Clone the repository on your own machine.
+    * Develop unit tests for the new implementation. (Please make sure the existing unit tests are passing.) Update existing unit tests if necessary.
+    * Commit and push changes on your own branch.
+    * Create a Pull Request.
+    * We’ll review and be in touch.
+
+Please always feel free to contact us at [email protected] if you prefer to correspond via email.