(gh-2) Added CONTRIBUTING.md

CONTRIBUTING.md

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+Contributing
+============
+
+## Communication
+
+Don't be shy, ask for help. If you have a question, comment, concern, or
+great idea just open up an issue to start the conversation. You can
+also email me.
+
+## Commits
+
+* __Rebase__: Whenever you have made commits on your local copy while at 
+  the same time commits have been made upstream you should `rebase` instead
+  of pull/merge. Rebasing will put the upstream commits before your new
+  local commits.
+
+  ```sh
+  git pull --rebase upstream
+  ```
+
+* __References__: When you are addressing a issue you should reference
+  that issue in your commits or pull requests. For example, if you just
+  addressed issue #11 the first line of your commit message should be
+  prefixed with `(gh-11)`. Check out this commit https://github.com/cameronbwhite/Flask-CAS/commit/cfa2cde631e6f4053acc54da4ea21c14c2dde35f 
+
+## Testing
+
+All code summited needs to pass the current test suite. 
+
+### Testing Dependencies
+
+Installation of Flask-CAS does not install the testing dependencies.
+You will need to install `Nose` and `Mock`. The dependencies can be
+installed with pip.
+
+```sh
+pip install Nose Mock
+```
+
+### Running Tests
+
+Tests can be ran locally as well as by TravisCI. 
+
+```sh
+python setup.py nosetests --with-doctest
+```
+
+## License
+
+This project is under the BSD Clause 3 license. Any and all
+future contributions will be licensed the same. If you put statements that
+declare your code licensed under anything else they will not be pulled.