Update dev quick start
Update dev quick start

Update dev quick start by adding some info for how to discover
and interact with templates.

Change-Id: I77ff0ca1d7938689072c3a32aadd4f9df0a85066

sajuptpm/magnum,openstack/magnum,eshijia/SUR,hongbin/magnum,LaynePeng/magnum,ArchiFleKs/magnum,dimtruck/magnum,ddepaoli3/magnum,mjbrewer/testindex,LaynePeng/magnum,dimtruck/magnum,paulczar/magnum,Tennyson53/magnum,ramielrowe/magnum,mjbrewer/testindex,eshijia/magnum,openstack/magnum,jay-lau/magnum,Alzon/SUR,sajuptpm/magnum,ArchiFleKs/magnum,annegentle/magnum,ddepaoli3/magnum,eshijia/magnum,ffantast/magnum,mjbrewer/testindex,hongbin/magnum,ffantast/magnum,eshijia/SUR,Tennyson53/magnum,Tennyson53/SUR,Tennyson53/SUR,paulczar/magnum,Alzon/SUR,ChengTiesheng/magnum,ChengTiesheng/magnum,annegentle/magnum,ramielrowe/magnum