Initial release

This is an initial release of Keycloak Operator with the following functionalities:

• Install Keycloak to a namespace
• Import Keycloak Realms
• Import Keycloak Clients
• Import Keycloak Users
• Create scheduled backups of the database
• Install Extensions

Here are a few links that might be helpful:

• Operatorhub page
• Documentation
• Issue tracker

Special thanks to all involved in this initiative - @abstractj @pb82 and @davidffrench !