Adding a CONTRIBUTING file.
Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+See the [./docs/contributing.rst](./docs/contributing.rst) file.
diff --git a/docs/contributing.rst b/docs/contributing.rst
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+How to Contribute
+=================
+
+We'd love to accept your patches and contributions to this project.
+There are just a few small guidelines you need to follow.
+
+Contributor License Agreement
+-----------------------------
+
+Contributions to this project must be accompanied by a Contributor
+License Agreement. You (or your employer) retain the copyright to your
+contribution; this simply gives us permission to use and redistribute
+your contributions as part of the project. Head over to
+https://cla.developers.google.com/ to see your current agreements on
+file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already
+submitted one (even if it was for a different project), you probably
+don't need to do it again.
+
+Code reviews
+------------
+
+All submissions, including submissions by project members, require
+review. We use GitHub pull requests for this purpose. Consult `GitHub
+Help <https://help.github.com/articles/about-pull-requests/>`__ for more
+information on using pull requests.
+
+Community Guidelines
+--------------------
+
+This project follows `Google's Open Source Community
+Guidelines <https://opensource.google/conduct/>`__.
+
+.. include:: code-of-conduct.rst
+ :start-after: community_guidelines_text
