Cherry-pick #15955 to 7.x: Add Kafka README for manual testing #16053
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Cherry-pick of PR #15955 to 7.x branch. Original message:
What does this PR do?
This PR adds docs on how to manual test Kafka Module locally.
Why is it important?
Bringing up a Kafka instance and having Kafka Module successfully connected to it's broker can be tricky. These docs provide a fast way to go with.
Checklist
Related issues
@sayden @jsoriano @faec feel free to comment/suggest anything!