Add license info for nuage horizon project
Add license info for nuage horizon project

Change-Id: I656e98056f4a6a90420b5caec6daafbb3f5dccd4
Closes-Bug: INF-2321

nuagenetworks/nuage-openstack-horizon,nuagenetworks/nuage-openstack-horizon,nuagenetworks/nuage-openstack-horizon,nuagenetworks/nuage-openstack-horizon