added doc about contributions

Author: sideffect0

CONTRIBUTING.md

@@ -0,0 +1,14 @@
+Guidelines For Contributing Code
+================================
+
+If you're ready to contribute back some code/docs, the
+process should look like:
+
+* Fork the project on GitHub into your own account.
+* Clone your copy of Tastypie.
+* Make a new branch in git & commit your changes there.
+* Push your new branch up to GitHub.
+* Ensure there isn't already an issue or pull request out there on it.
+  If you feel you have a better fix, please take note of the issue
+  number & mention it in your pull request.
+* Create a new pull request (based on your branch).