add credit view for credit creator

This is definitely what I suggested (thank you!), but it occurs to me that it's actually fully wagneerable.  we could do this in the claim structure:

    {{_self|core; structure:creator credit}}

...and then in the "creator credit" card to this:

       added
       {{_self | created_at }}}
       ago by
       {{+*creator | core | link }}

What do you think? Shall we try that?

(Sorry for not thinking of that sooner)