Add jose-c to jwt.io

[danpe]

It's not really a issue but something you might wanna do :)

Add this library to https://jwt.io/ libraries listing.
(https://github.com/jsonwebtoken/jsonwebtoken.github.io/tree/master/views/libraries)

[jbdatko]

Ah thanks, I wondered how one add their library. It looks like the community is pushing to require implementation of the RFC 7520 test vectors (issue #7) prior to the library being approved, which is a good requirement.

I added that issue and once complete, I'll submit this.