Agree a set of related reference/target formats

[eocarragain]

trafficstars

We should identify related projects in this area (other than DataCrate). This will help:

• inform and validate ROLite spec against real examples in the wild;
• provide examples of how new domain-specific formats could benefit from ROLite as an extensible, generic base-specification
• potentially lead to alignment, collaboration, adoption

See #2 (WholeTale) an #3 as examples.

There are a large number of such projects (see https://docs.google.com/document/d/155lA2BcixTl-zwJHGfLkxsmg7WmQbBK00QWyP8QggkE/edit?usp=sharing), so we should agree early which subset are relevant references for ROLite work