docs: update contributing docs

[andrewthetechie]

Add some docs on how to run a postgres instance via docker-compose

This also removes the mssql server from the docker-compose file in
tests. It currently does not work (the service crashes) and isn't needed
for tests to succeed

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[awtkns]

Thanks so much for this @andrewthetechie! 🚀

fyi MSSQL will be re-enable (and working) once #112 is merged.

[andrewthetechie]

Thanks so much for this @andrewthetechie! 🚀

fyi MSSQL will be re-enable (and working) once #112 is merged.

You're welcome! I'm working on a new backend implementation to use pydantic-aioredis and ran into trouble while setting up tests. I figured if I ran into trouble, someone else would too so I might as well share it forward :)