Merge pull request #29 from harmonydata/add_topic_strengths

Add topic strengths

Guide to contributing

Update __init__.py

Merge branch 'main' of https://github.com/harmonydata/harmony

Merge branch 'main' of https://github.com/harmonydata/harmony

Update __init__.py

catch no transformers

Documenting package