Documenting the data model

[tomchop]

In a Mastodon thread, @benmontour asked:

For the most part it looks like a simplified STIX with a few additions and tweaks. Is there documentation somewhere to help ensure normalization across things like Feeds bringing in data?
I've already been working on some documentation and diagrams but figured maybe I should ask first to make sure I'm not duplicating work.

The intention behind yeti is to leave a lot of control to its users on how they want things set up.

• Maybe have some recommended guidelines on how to ingest data would be good?
• Given that 'source' is mandatory for the Yeti UI to work properly, we should also consider making it a mandatory parameter of context.

[tomchop]

Opened #920 to track the mandatory source keying