[Community goal] Update contributor documentation

As the Ussuri goal we have an OpenStack project wide contributing
documentation template [1]. Nova has its own contributor documentation
so this patch adds the new contributing.rst according to the global
template and links the sections in it to the existing Nova contributor
documentation.

Also the top level CONTRIBUTING.rst template has been changed in the
cookiecutter repo[2]. So this patch updates the CONTRIBUTING.rst according
to the new template.

[1] https://opendev.org/openstack/cookiecutter/src/branch/master/%7b%7bcookiecutter.repo_name%7d%7d/doc/source/contributor/contributing.rst
[2] https://review.opendev.org/#/c/696001

Change-Id: Ia12cd4acbb63f192fcaf0790b72f8e977025a9dc
Story: #2007236
Task: #38541

CONTRIBUTING.rst

@@ -1,16 +1,19 @@
-If you would like to contribute to the development of OpenStack,
+The source repository for this project can be found at:
-you must follow the steps in this page:
 
-   https://docs.openstack.org/infra/manual/developers.html
+   https://opendev.org/openstack/nova
 
-Once those steps have been completed, changes to OpenStack
+Pull requests submitted through GitHub are not monitored.
-should be submitted for review via the Gerrit tool, following
-the workflow documented at:
 
-   https://docs.openstack.org/infra/manual/developers.html#development-workflow
+To start contributing to OpenStack, follow the steps in the contribution guide
+to set up and use Gerrit:
 
-Pull requests submitted through GitHub will be ignored.
+   https://docs.openstack.org/contributors/code-and-documentation/quick-start.html
 
-Bugs should be filed on Launchpad, not GitHub:
+Bugs should be filed on Launchpad:
 
    https://bugs.launchpad.net/nova
+
+For more specific information about contributing to this repository, see the
+Nova contributor guide:
+
+   https://docs.openstack.org/nova/latest/contributor/contributing.html

doc/source/contributor/contributing.rst

@@ -0,0 +1,62 @@
+============================
+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 nova.
+
+Communication
+~~~~~~~~~~~~~
+
+:doc:`how-to-get-involved`
+
+Contacting the Core Team
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+The overall structure of the Nova team is documented on `the wiki
+<https://wiki.openstack.org/wiki/Nova#People>`_.
+
+New Feature Planning
+~~~~~~~~~~~~~~~~~~~~
+
+If you want to propose a new feature please read the :doc:`blueprints` page.
+
+Task Tracking
+~~~~~~~~~~~~~
+
+We track our tasks in `Launchpad <https://bugs.launchpad.net/nova>`__.
+
+If you're looking for some smaller, easier work item to pick up and get started
+on, search for the 'low-hanging-fruit' tag.
+
+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/nova/+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 Nova requires two ``Code-Review +2`` votes from
+Nova core reviewers before one of the core reviewers can approve patch by
+giving ``Workflow +1`` vote. More detailed guidelines for reviewers of Nova
+patches are available at :doc:`code-review`.
+
+
+Project Team Lead Duties
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+All common PTL duties are enumerated in the `PTL guide
+<https://docs.openstack.org/project-team-guide/ptl.html>`_.
+
+For the Nova specific duties you can read the Nova PTL guide
+:doc:`ptl-guide`

doc/source/contributor/index.rst

@@ -7,6 +7,14 @@ enhance documentation, and increase testing. Contributions of any type are
 valuable, and part of what keeps the project going. Here are a list of
 resources to get your started.
 
+Basic Information
+=================
+
+.. toctree::
+   :maxdepth: 2
+
+   contributing
+
 Getting Started
 ===============
 

doc/source/index.rst

@@ -222,6 +222,8 @@ Reference Material
 For Contributors
 ================
 
+* :doc:`contributor/contributing`: If you are a new contributor this should
+  help you to start contributing to Nova.
 * :doc:`contributor/index`: If you are new to Nova, this should help you start
   to understand what Nova actually does, and why.
 * :doc:`reference/index`: There are also a number of technical references on
@@ -234,6 +236,7 @@ For Contributors
    :hidden:
 
    contributor/index
+   contributor/contributing
    reference/index
 
 .. only:: html