DOC: I took more documentation from the pypi README page and added it to the

Sphinx documentation.

docs/contributing.rst

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+***************************
+Contributing to the project
+***************************
+
+Style Guide
+===========
+
+To ensure that changes and patches are focused on behavior changes,
+the zipline codebase adheres to PEP-8,
+`<http://www.python.org/dev/peps/pep-0008/>`_.
+
+The maintainers check the code using the flake8 script,
+`<https://github.com/jcrocholl/pep8/>`_, which is included in the
+requirements_dev.txt.
+
+Before submitting patches or pull requests, please ensure that your
+changes pass 
+
+::
+
+    flake8 --ignore=E124,E125,E126 zipline tests
+
+Discussion and Help
+===================
+
+Discussion of the project is held at the Google Group,
+`<zipline@googlegroups.com>`_,
+`<https://groups.google.com/forum/#!forum/zipline>`_.
+
+Source
+======
+
+The source for Zipline is hosted at
+`<https://github.com/quantopian/zipline>`_.
+
+Contact
+=======
+
+For other questions, please contact `<opensource@quantopian.com>`_.
+