Add open liberty guide towards the end for trying out Open Liberty operator

[Emily-Jiang]

I watched one youtube video that tried to follow this user guide to use Open Liberty operator and then try to find an app to use. They spent a long time for a useful app to further their journey. It will be great to add this guide for the end to end user experience.
https://openliberty.io/guides/cloud-openshift-operator.html