[ussuri][goal] Update contributor documentation

This patch updates/adds the contributor documentation to follow
the guidelines of the Ussuri cycle community goal[1].

[1] https://governance.openstack.org/tc/goals/selected/ussuri/project-ptl-and-contrib-docs.html
Story: #2007236
Task: #38554

Change-Id: I1c5e5ae8c734ab051bb889588dfd0fa908ee4ff3

CONTRIBUTING.rst

@@ -0,0 +1,19 @@
+The source repository for this project can be found at:
+
+   https://opendev.org/openstack/devstack-plugin-nfs
+
+Pull requests submitted through GitHub are not monitored.
+
+To start contributing to OpenStack, follow the steps in the contribution guide
+to set up and use Gerrit:
+
+   https://docs.openstack.org/contributors/code-and-documentation/quick-start.html
+
+Bugs should be filed on Launchpad:
+
+   https://bugs.launchpad.net/devstack-plugin-nfs
+
+For more specific information about contributing to this repository, see the
+Devstack Plugin NFS contributor guide:
+
+   https://docs.openstack.org/devstack-plugin-nfs/latest/contributor/contributing.html

doc/source/contributor/contributing.rst

@@ -0,0 +1,55 @@
+============================
+So You Want to Contribute...
+============================
+
+For general information on contributing to OpenStack, please check out the
+`contributor guide <https://docs.openstack.org/contributors/>`_ to get started.
+It covers all the basics that are common to all OpenStack projects: the accounts
+you need, the basics of interacting with our Gerrit review system, how we
+communicate as a community, etc.
+
+Below will cover the more project specific information you need to get started
+with Devstack Plugin NFS.
+
+Communication
+~~~~~~~~~~~~~
+* IRC channel ``#openstack-qa`` at FreeNode
+* Mailing list (prefix subjects with ``[qa]`` for faster responses)
+  http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-discuss
+
+Contacting the Core Team
+~~~~~~~~~~~~~~~~~~~~~~~~
+Please refer to the `Devstack Plugin NFS Core Team
+<https://review.opendev.org/#/admin/groups/1196,members>`_ contacts.
+
+New Feature Planning
+~~~~~~~~~~~~~~~~~~~~
+If you want to propose a new feature please read `Feature Proposal Process`_
+Devstack features are tracked on `Launchpad BP <https://blueprints.launchpad.net/devstack-plugin-nfs>`_.
+
+Task Tracking
+~~~~~~~~~~~~~
+We track our tasks in `Launchpad <https://bugs.launchpad.net/devstack-plugin-nfs>`_.
+
+Reporting a Bug
+~~~~~~~~~~~~~~~
+You found an issue and want to make sure we are aware of it? You can do so on
+`Launchpad <https://bugs.launchpad.net/devstack-plugin-nfs/+filebug>`__.
+More info about Launchpad usage can be found on `OpenStack docs page
+<https://docs.openstack.org/contributors/common/task-tracking.html#launchpad>`_
+
+Getting Your Patch Merged
+~~~~~~~~~~~~~~~~~~~~~~~~~
+All changes proposed to the Devstack Plugin NFS requires two ``Code-Review +2`` votes from
+core reviewers before one of the core reviewers can approve patch by
+giving ``Workflow +1`` vote.
+
+Project Team Lead Duties
+~~~~~~~~~~~~~~~~~~~~~~~~
+All common PTL duties are enumerated in the `PTL guide
+<https://docs.openstack.org/project-team-guide/ptl.html>`_.
+
+The Release Process for QA is documented in `QA Release Process
+<https://wiki.openstack.org/wiki/QA/releases>`_.
+
+.. _Feature Proposal Process: https://wiki.openstack.org/wiki/QA#Feature_Proposal_.26_Design_discussions

doc/source/index.rst

@@ -7,6 +7,15 @@ Welcome to Devstack Plugin NFS's documentation!
 
    readme
 
+For Contributor
+---------------
+If you are a new contributor to devstack-plugin-nfs, please refer to: :doc:`contributor/contributing`
+
+.. toctree::
+   :hidden:
+
+   contributor/contributing
+
 Indices and tables
 ------------------