Add instructions to the README
Add instructions to the README

Add instructions for using the package to the README.

Change-Id: I51315d65fe29160bf03fb6f45ed6ae88133d4cb5

openstack/openstackdocstheme,vauxoo-tests/vauxoodocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme,vauxoo-tests/vauxoodocstheme,openstack/openstackdocstheme,vauxoo-tests/vauxoodocstheme