keygen and client-certificates document available

Hi folks!

In September, Tim posted about <keygen> [1] which started a conversation about it on this list. The TAG has since met and discussed this topic, and we now have a document published with our latest thoughts. This document has our rough consensus at this point, and we additionally welcome feedback from you. As such, we've put the doc in a Repo [2] that has an issue tracker, so feel free to open issues against this document and we'll do our best to resolve them. Thanks!

Keygen and client certificates document: http://w3ctag.github.io/client-certificates/

[1] http://lists.w3.org/Archives/Public/www-tag/2015Sep/0000.html
[2] https://github.com/w3ctag/client-certificates