add build inventory and deploy to docs

Skip-Release-Notes
Closes-Bug: CLOUDOPS-947

Change-Id: Id342799dc378cba8e52b27f095f4c32df4d0144a
diff --git a/doc/source/deploy/deployment.rst b/doc/source/deploy/deployment.rst
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+======================
+Environment Deployment
+======================
+
+After you create the inventory, and update the configuration files for OpenStack services,
+Kubernetes, Ceph and certificates, you can deploy the Atmosphere platform using the following
+commands:
+
+.. code-block:: bash
+
+    python3 -m venv atmosphere-venv && source atmosphere-venv/bin/activate
+
+    pip install -r atmosphere/requirements.txt
+    cd cloud-config
+    ansible-galaxy install -r requirements.yml
+    ansible-playbook -i inventory/hosts.ini  -u ubuntu -b playbooks/site.yml
+
+It's suggested to run the deployment process from a dedicated machine that
+has ssh access to all the hosts in the inventory file.
+
+You can edit the site.yml to include only the roles that you need to deploy
+if you want to deploy only a subset of the platform at a time.