Should clearly separate concerns

[mprorock]

Readme currently blends different but related things like OIDC and VCs. There are a few different topics that should be clearly separate for work in this area (though some specs will cross over between multiple topics)

1. identity formats, data model, and contents
2. Credential Data Model that references those identities or are issued by identities
3. security model for identities and credentials - i.e. How we encode, sign, and verify data
4. Protocols for exchanging that data

Fortunately some of these items are well covered with work at IETF, other items are in incubation, and some provide a nice bridge between work at different SDOs like
https://w3c.github.io/vc-jose-cose/

The above groups/categories/topics might not be perfect, but they have been helpful to our team in understanding how a particular spec fits into the ecosystem