Add README and metadata for collection roles

[oraNod]

Roles need to have README.md files along with metadata otherwise galaxy-importer fails.

Running galaxy-importer results in WARNING: Could not get role description, no role metadata found and this exception: galaxy_importer.exceptions.ContentLoadError: No role readme found.

That appears to come from https://github.com/ansible/galaxy-importer/blob/888e9706f913af88ea903b269ef113444060fc0a/galaxy_importer/loaders/content.py#L250

I couldn't see anywhere in Ansible docs that it says README.md files are required for roles but galaxy-importer seems to enforce it. There is a section on the required metadata in docs here though: https://docs.ansible.com/projects/ansible/latest/playbook_guide/playbooks_reuse_roles.html

[oraNod]

Tested in my fork with the certification checker workflow: https://github.com/oraNod/f5-bd-ansible-platform-modernization/actions/workflows/certification.yml

The first run is without any changes and reproduces the galaxy-importer error. @VDI-Tech-Guy FYI