Added an example of docker compose file

[CyborTronik]

Added a simple example docker-compose file, that can be used for reference, to avoid searching over interned for already compiled containters.

Why are these changes needed?

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[Josephrp]

it's not clear why inline code is more clear than the three containers referenced just afterwards , and also why the inline code is not provided along with the containers in the repo

[gitguardian]

️✅ There are no secrets present in this pull request anymore.

If these secrets were true positive and are still valid, we highly recommend you to revoke them.
Once a secret has been leaked into a git repository, you should consider it compromised, even if it was deleted immediately.
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[jackgerrits]

I see the CLA was not signed, please feel free to reopen and accept that if you're interested in contributing