Add a CONTRIBUTING.rst for Kolla

Change-Id: I9910b4fba5ef11c26e687af3273e4fccaf5f235f
Closes-Bug: #1570017

doc/CONTRIBUTING.rst

+=================
+How To Contribute
+=================
+
+Basics
+~~~~~~
+
+* Our source code is hosted on `OpenStack GitHub`_, but pull requests submitted
+  through GitHub will be ignored. Bugs should be filed on launchpad_,
+  not GitHub.
+
+* Please follow OpenStack `Gerrit Workflow`_ to to contribute to Kolla.
+
+* Note the branch you're proposing changes to. ``master`` is the current focus
+  of development. Kolla project has a strict policy of only allowing backports
+  in ``stable/branch``, unless when not applicable. A bug in a ``stable/branch``
+  will first have to be fixed in ``master``.
+
+* Please file a launchpad_ blueprint for any significant code change and a bug
+  for any significant bug fix or add a TrivialFix tag for simple changes.
+  See how to reference a bug or a blueprint in the commit message here_
+
+* TrivialFix tags or bugs are not required for documentation changes.
+
+.. _OpenStack GitHub: https://github.com/openstack/kolla
+.. _Gerrit Workflow: http://docs.openstack.org/infra/manual/developers.html#development-workflow
+.. _launchpad: https://bugs.launchpad.net/kolla
+.. _here: https://wiki.openstack.org/wiki/GitCommitMessages
+
+Development Environment
+~~~~~~~~~~~~~~~~~~~~~~~
+
+* Please follow our `quickstart`_ to deploy your environment and test your changes
+
+.. _quickstart: http://docs.openstack.org/developer/kolla/quickstart.html

doc/index.rst

@@ -32,6 +32,7 @@ Kolla Overview
 .. toctree::
    :maxdepth: 1
 
+   CONTRIBUTING
    deployment-philosophy
    quickstart
    heat-dev-env