Update templates README with list of secure vs insecure templates
Update templates README with list of secure vs insecure templates

Signed-off-by: Steven Dake <8638f3fce5db0278cfbc239bd581dfc00c29ec9d@redhat.com>

dims/heat,cwolferh/heat-scratch,srznew/heat,maestro-hybrid-cloud/heat,redhat-openstack/heat,openstack/heat-cfntools,varunarya10/heat,openstack/heat,noironetworks/heat,dims/heat,cryptickp/heat,rh-s/heat,JioCloud/heat,jasondunsmore/heat,miguelgrinberg/heat,pshchelo/heat,steveb/heat,steveb/heat-cfntools,cryptickp/heat,dragorosson/heat,bbandaru/heat-cfntools,steveb/heat,NeCTAR-RC/heat,cwolferh/heat-scratch,rh-s/heat,takeshineshiro/heat,srznew/heat,noironetworks/heat,varunarya10/heat,jasondunsmore/heat,ntt-sic/heat,sdake/heat-jeos,JioCloud/heat,maestro-hybrid-cloud/heat,miguelgrinberg/heat,ntt-sic/heat,gonzolino/heat,rickerc/heat_audit,steveb/heat-cfntools,Triv90/Heat,redhat-openstack/heat,takeshineshiro/heat,pratikmallya/heat,pratikmallya/heat,Triv90/Heat,rdo-management/heat,openstack/heat,gonzolino/heat,rdo-management/heat,Triv90/Heat,rickerc/heat_audit,dragorosson/heat,citrix-openstack-build/heat,pshchelo/heat,citrix-openstack-build/heat,NeCTAR-RC/heat