publish context file for renderMethod

[jchartrand]

At the moment we can use the renderMethod like so in a Verifiable Credential version 2:

"@context": [
        "https://www.w3.org/ns/credentials/v2",
        "https://purl.imsglobal.org/spec/ob/v3p0/context-3.0.3.json",
        "https://w3id.org/security/suites/ed25519-2020/v1"
        {
            "css3MediaQuery": "urn:uuid:c4c53282-e8e2-4914-83d8-566e25d2f899",
            "HTMLRenderingTemplate": "urn:uuid:925d00aa-ae94-4278-89d5-1cb59a8025e8"
        }
    ],
"renderMethod": [
        {
            "id": "https://raw.githubusercontent.com/digitalcredentials/test-files/main/html-templates/mock-MIT-bachelors-template.html",
            "type": "HTMLRenderingTemplate",
            "name": "PDF Display",
            "css3MediaQuery": "@media (orientation: portrait)"
        }
    ]

It would be nice to instead have a context something like:

"@context": [
        "https://www.w3.org/ns/credentials/v2",
        "https://purl.imsglobal.org/spec/ob/v3p0/context-3.0.3.json",
        "https://w3id.org/security/suites/ed25519-2020/v1",
        "https://w3id.org/ns/credentials/render/v1"         <======= NEW 
    ],
"renderMethod": [
        {
            "id": "https://raw.githubusercontent.com/digitalcredentials/test-files/main/html-templates/mock-MIT-bachelors-template.html",
            "type": "HTMLRenderingTemplate",
            "name": "PDF Display",
            "css3MediaQuery": "@media (orientation: portrait)"
        }
    ]

where the https://w3id.org/render/v1 defines the template types and anything else needed for the renderMethod.

@dmitrizagidulin

[davidlehn]

• https://w3id.org/ns/ is being used for something else already (see https://github.com/perma-id/w3id.org/tree/master/ns)
• For initial testing purposes, I had created https://w3id.org/vc/render-method/v1 (see https://github.com/perma-id/w3id.org/blob/master/vc/render-method/.htaccess) and hooked it up to this: https://github.com/digitalbazaar/vc-render-method-context/blob/main/contexts/vc-render-method-v1.jsonld. It's not at all complete.
• Some other projects use https://w3id.org/vc-*/ instead.
• The spec here could use a whole bunch of work. I imagine creating and updating contexts that live in this repo would be a part of that. The above URL could be redirected here if needed.
• Feel free to propose updates to the above existing work. It needs help.