add did:vaa: method

[caict-develop-zhangbo]

Spec here https://github.com/caict-develop-zhangbo/vaa-method/blob/master/README.md

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[OR13]

You may want to watch for did core spec changes related to "metadata", this is one of the few did methods I have seen that includes "updated', "created" and "revoked" timestamps in the did document.

Privacy and Security Considerations section could use a little more clarity, for example:

"DID documents use signature technology to prevent malicious error correction."

I don't see signatures on the HTTP based operations, or on the documents themselves.

[OR13]

@caict-develop-zhangbo putting this on your radar: w3c/did-core#174 (comment)

[caict-develop-zhangbo]

@caict-develop-zhangbo putting this on your radar: w3c/did-core#174 (comment)

You may want to watch for did core spec changes related to "metadata", this is one of the few did methods I have seen that includes "updated', "created" and "revoked" timestamps in the did document.

Privacy and Security Considerations section could use a little more clarity, for example:

"DID documents use signature technology to prevent malicious error correction."

I don't see signatures on the HTTP based operations, or on the documents themselves.

Thanks for review, I've adjusted the "updated', "created" and "revoked" timestamps and added signatures instructions

[msporny]

Meets minimum requirements for provisional registration.