[Openid-specs-ab] Issue #1609: add x5c and jwk to credential_binding_methods_supported (openid/connect)

[Kristina Yasuda]

New issue 1609: add x5c and jwk to credential_binding_methods_supported
https://bitbucket.org/openid/connect/issues/1609/add-x5c-and-jwk-to

Kristina Yasuda:

Currently the spec says that ``A non-exhaustive list of valid (credential_binding_methods_supported) values defined by this specification are `did`, `mso`, and `none`.``

@{557058:245bbbf8-3623-466b-9e2f-a9fa2f30c0ee} clarified implementations also need `` `jwk` and `x5c` ``, which I agree should be added.