Watcher official install-guide

Currently watcher project does not have an official
install guide at [1]

This patch adds watcher install guide for rdo and debian.

install-guide is written following the document [2].

[1] https://docs.openstack.org/project-install-guide/ocata/
[2] https://docs.openstack.org/contributor-guide/project-install-guide.html

Change-Id: Idfae7286003f81222dadf91ddcaf95a42c7eb07f

install-guide/source/install-ubuntu.rst

@@ -0,0 +1,34 @@
+.. _install-ubuntu:
+
+Install and configure for Ubuntu
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This section describes how to install and configure the Infrastructure Optimization
+service for Ubuntu 14.04 (LTS).
+
+.. include:: common_prerequisites.rst
+
+Install and configure components
+--------------------------------
+
+1. Install the packages:
+
+   .. code-block:: console
+
+      # apt install watcher-api watcher-decision-engine \
+        watcher-applier
+
+      # apt install python-watcherclient
+
+.. include:: common_configure.rst
+
+Finalize installation
+---------------------
+
+Restart the Infrastructure Optimization services:
+
+.. code-block:: console
+
+   # service watcher-api restart
+   # service watcher-decision-engine restart
+   # service watcher-applier restart