Added heat templates repo.

orchestration/create_a_template.md

@@ -9,6 +9,8 @@ Heat consumes templates written in "Heat Orchestration Template" (HOT) format.
 
 Heat can also use templates in AWS CloudFormation template format.
 
+Reference: [Heat Templates Repository](https://github.com/openstack/heat-templates)
+
 
 ## Complete Example