[contributor] Add contributor guide locations
[contributor] Add contributor guide locations

Change-Id: I5b73331b50c6c3bc63b2f69731d744950876c1c7
Closes-Bug: #1529442

openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals