Add docs

[daavoo]

README: https://github.com/mozilla-ai/osm-ai-helper/blob/add-docs/README.md
Docs: https://mozilla-ai.github.io/osm-ai-helper/

[stefanfrench]

@daavoo This is great work. Added a few comments about the docs.

[stefanfrench]

@daavoo - What do you think about us adding a Diagram similar to the other Blueprints. We could have something like Create a Custom Dataset -> Finetune a model using the dataset -> Use the model to contribute to OSM

[daavoo]

Sure

[daavoo]

@stefanfrench check the updated notebooks and docs:

• https://colab.research.google.com/github/mozilla-ai/osm-ai-helper/blob/add-docs/demo/create_dataset.ipynb
• https://colab.research.google.com/github/mozilla-ai/osm-ai-helper/blob/add-docs/demo/finetune_model.ipynb
• https://mozilla-ai.github.io/osm-ai-helper/

[stefanfrench]

@daavoo Thanks for making all the required changes. Approved.