Docs, docs, and more docs

[thebigmunch]

I've been holding off on really writing docs until https://github.com/pawamoy/mkdocstrings/issues/27 comes to fruition. I want to use MkDocs, but I can't live without an autodoc reference. I want to have at least the autodoc and some basic tutorial/how-to stuff up before diving into dump support. So, I will likely need to do this before mkdocstrings is ready.

[adcousin]

Good day, just a note from a not so smart user.
Thanks a lot for what you already achieved. That's neat.
Regarding documentation, I was wondering if and how it was possible to deactivate AudioMetadataWarning messages. Nothing really important but it might be considered here I guess.
Thanks again for your job, I messed up my whole music library today and you helped me to re-organize it.