Stats document - status and intent to call for FPWD

Thanks to Varun Singh's valiant efforts, we now have a stats draft that 
is in W3C format.

It's hosted on github, and is visible here:

http://w3c.github.io/webrtc-stats/

The repository and tracker is here:

https://github.com/w3c/webrtc-stats

We intend to ask the WG chairs (the one who isn't an author) to issue a 
call for adoption of this draft as FPWD (First Public Working Draft) soon.

            Harald