Add license table

[stepps00]

Add license table for CC equivalences and allowed / disallowed use-cases. Maybe this needs new properties in the source JSONs, too so it can be auto generated like the big README.md.

Example:

license type	license equivalent	details
OGL, british colombia	CC0	you can do:...
OGL Flanders	CC0	you can do:...
CC0	CC0	you can do:…
Public Domain	CC0	you can do:…
CC-BY	CC-BY	you can do:...
restricted	concordance only	you can only...