Updated the README.rst
Updated the README.rst

Updated the Readme.rst with some formatting issues. Also
stole the ending line from the Nova to point in the direction
of the CONTRIBUTING.rst.

Change-Id: I595b7feb641aee91d47ba55eedab29e7511bfa35

hareeshpc/networking-cisco,CiscoSystems/networking-cisco,cisco-openstack/networking-cisco,Gitweijie/first_project,Gitweijie/first_project,nikolay-fedotov/networking-cisco,Tehsmash/networking-cisco,Tehsmash/networking-cisco,CiscoSystems/networking-cisco,cisco-openstack/networking-cisco,hareeshpc/networking-cisco,noironetworks/networking-cisco,openstack/networking-cisco,noironetworks/networking-cisco,openstack/networking-cisco