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This is the first step of completing the contributor doc goal[0] from the Ussuri cycle. It adds a contributing.rst policy which uses the cookiecutter template created for the goal. The expectation is that this is a central location for all of this information, and the contributing.rst in each Oslo project will simply refer to it so we aren't maintaining it in 40+ repos. 0: https://governance.openstack.org/tc/goals/selected/ussuri/project-ptl-and-contrib-docs.html Change-Id: I3347d553b50a52ae96186e60b729360b159d8df5