add example usage instructions

Author: vsoch

example/README.md

@@ -8,5 +8,4 @@ The intention of this script is to instantiate a client, and then match
 containers you have in some root from [Galaxy Project Depot](https://depot.galaxyproject.org/singularity/)
 on your local filesytem to install to an shpc registry (as modules). The script
 tries to be efficient and instantiate one remote registry that has all the containers.
-
-### Usage
+See the script header for usage examples.