Add CONTRIBUTING.md

CONTRIBUTING.md

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+# ToopherAPI Python Client
+
+#### Python Version
+>=2.6.0
+
+#### Installing Dependencies
+Toopher uses [pip](https://pypi.python.org/pypi/pip) to install packages.
+
+To ensure all dependencies are up-to-date run:
+```shell
+$ pip install -r requirements.txt
+```
+
+#### Tests
+To run tests enter:
+```shell
+$ python tests.py
+```