MetroCat69

create CONTRIBUTING.md

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Maybe we can create a CONTRIBUTING.md file explaining stuff about the project structure and how for example you should create a new transformer. I am new to this project so...

**Describe the bug** Mongodb Atlas tests assume specific documents, collections and databases exists so tests in test_embedding_retrieval automaticly fail additionally test_embedding_retrieval and test_embedding_retrieval_async are searching for MONGO_CONNECTION_STRING_2 and till be...

added partial test setup #1659

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### Related Issues - Fixes #1659 ### Proposed Changes ### How Did You Test It? All unit tests passed after running `hatch run test` with a brand new MongoDB Atlas...