Add CONTRIBUTING.rst to doc/source/dev

Change-Id: I04a7a245ea7ca3dfad9bc127e318169083523fa8

doc/source/dev/CONTRIBUTING.rst

@@ -0,0 +1,59 @@
+Bifrost is a part of Ironic, which is an OpenStack project and
+thus follows OpenStack development procedures.
+
+For a full (and official) description of the development workflow, see:
+
+    http://docs.openstack.org/infra/manual/developers.html#development-workflow
+
+For a highly abridged version, read on.
+
+-------------
+Communicating
+-------------
+
+Before you file a ticket or submit a pull request, its often helpful to chat
+with other developers.  The #openstack-ironic channel is a good place to start,
+and if you don't have IRC (or would prefer email), openstack-dev@lists.openstack.org
+is the mailing list for all OpenStack projects.  As the name implies, that mailing
+list is for all OpenStack development, so it's often harder to get attention on
+your particular issue.
+
+-----------
+Filing Bugs
+-----------
+
+Bugs should be filed on Launchpad, not GitHub:
+
+    https://bugs.launchpad.net/bifrost
+
+-----------------
+Contributing Code
+-----------------
+
+Bifrost requires a valid OpenStack contributor agreement to be signed before
+code can be accepted.  Details can be found in the development workflow link
+above.
+
+Code isn't committed directly (so pull requests won't work); instead, the
+code is submitted for review through Gerrit via git review, and once its
+been sufficiently reviewed it will be merged from there.
+
+Once that's done, the development workflow is, roughly::
+
+   $ git clone https://git.openstack.org/openstack/bifrost
+   $ cd bifrost
+   $ git checkout -b some-branch-name
+   ... hack hack hack ...
+   $ git commit
+   $ git review
+   ... The configuration details for this are in .gitreview.
+   ... When the command runs, it will add a ChangeId to your commit
+   ... message and print out a link for your reference
+   ...
+   ... If you need to fix something in that commit, you can do:
+   $ git commit --amend
+   $ git review
+
+From that point on, the link the git review command generated is
+the place to do final tweaks.  When its approved, the code
+will be merged in automatically.