Register Well-Known URI

[clehner]

If /.well-known/did.json usage is to be kept (contrary to #50, but following https://github.com/w3c-ccg/did-method-web/pull/50#pullrequestreview-834762306), shall we register it with IANA/IETF?

• https://www.rfc-editor.org/rfc/rfc8615.html#section-5.2 "The Well-Known URI Registry"
• https://www.iana.org/assignments/well-known-uris/well-known-uris.xhtml
• https://github.com/protocol-registries/well-known-uris
• https://www.ietf.org/mailman/listinfo/wellknown-uri-review

[dmitrizagidulin]

+1 to this important question.