Discussion of proposed design for careteam work

Available for review, but please don't merge yet.
Yeah I did, but I had no idea what server-side data model you had in mind so was just considering this as a draft you could work off of.

My thought was that it would help me understand how things work (like knowing the structure of "permission" objects in Gatekeeper helps me understand). But maybe this belongs in those "reference" documents you were talking about, not this "guide".

Remove it?