document recommended environment and steps to get up and running quickly

[Fireant456]

Proposed changes in this pull request

documented recommended environment and steps to get up and running quickly based on our own experience and clarifications from Aiven support.

Type (put an x where ever applicable)

• [ ] Bug fix: Link to the issue
• [ ] Feature (Non-breaking change)
• [ ] Feature (Breaking change)
• [x] Documentation Improvement
• [ ] Other

Checklist

Please put an x against the checkboxes. Write a small comment explaining if its N/A (not applicable)

• [x] All the tests are passing after the introduction of new changes.
• [x] Added tests respective to the part of code I have written.
• [x] Added proper documentation where ever applicable (in code and README.md).

Optional extra information

We struggled greatly to get up and running with this tool locally in order to debug our migration we were attempting on the aiven cloud, had to clarify that Fedora was recommended by support and modify setup steps that were provided by the Readme.

I would love to see a docker container be released that allows users to spin up the container and start using aiven-db-migrate with a couple of commands.