update of PADI, includes suggestions of issue #96

[RieksJ]

This PR consists of stuff that I suggested to add in issue #96.

Since I wasn't sure how this relates to the Expert Diver focal use case (the text there forces me to make various assumptions that I'm not comfortable with), I have left a remark in the 'needs' section of the task I added that this still needs to be done.

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[stonematt]

good catch. This process should be part of the Verify Claim task, rather than it's own task. A revocation and status check is part of the verification process, as stated in the Datamodel in section 5.1:

A verifier verifies the authenticity of the presented verifiable presentation and verifiable credentials. This should include checking the credential status for revocation of the verifiable credentials.

Rather than make a new user task, let's update section 4.3 of the Use Cases.

Recommend: Reject this PR and make a new PR for Verify Claim.

[RieksJ]

@stonematt: can you explain how this works? I put effort in making a contribution, and then get confronted with a comment that doesn't respond to whay I intended to say, and my contribution gets rejected. Is this how it is done (i.e. without any discussion) or did I miss something?