Provide documentation support for the Ansible Playbook Bundle

Documentation is needed to explain how to use the Ansible Playbook Bundle for Red Hat Process Automation Manager.

It contains 5 plans each of them with different optional and mandatory parameters.

Trial
Authoring
Managed Environment
Immutable KIE Server
Immutable Monitor

It would be important to mention what the requirements are in terms of configuration and how to verify them. Examples:

HA + H2 database is not selected
When external database is selected, all the fields related are mandatory

Most of the configuration is the same as for the templates.