Create CONTRIBUTING.md

CONTRIBUTING.md

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+## About to contribute?
+
+We appreciate that. But before you do, please learn our basic rules:
+
+* Do you have a feature request? Then don't expect it to be implemented unless
+  you or someone else sends a [pull request](https://help.github.com/articles/using-pull-requests).
+* We love [pull requests](https://help.github.com/articles/using-pull-requests), 
+  but if you don't have a test to go with it we probably won't merge it.
+* Before making significant contribution consider discussing the outline of 
+  your solution first. This may avoid a duplication of efforts.
+
+Please do *not* add @author tags - this project embraces collective code 
+ownership. If you want to know who wrote some code, look in git. When you are
+done, send a [pull request](http://help.github.com/send-pull-requests/).
+If we get a pull request where an entire file is changed because of 
+insignificant whitespace changes we cannot see what you have changed, and your
+contribution might get rejected.