Added initial documentation about example setup

[JuanPTM]

initial version of the example setup description

[reqa]

Please add these points:

• What does this describe? A link to the playbook/task would probably be good?
• Motivation: For which purpose is this interesting? Mention the SCS persona that is the target of this documentation (see https://github.com/SovereignCloudStack/standards/blob/773646d1d6af19b151b21e6b706c946e8169c07d/GLOSSARY.md#personas)

[garloff]

Much better now.
Where on the docs page should this go?

[JuanPTM]

Much better now. Where on the docs page should this go?

I don't know, maybe @maxwolfs can help us here