Added Xbox One initial stats and thoughts

I got about 10 minutes alone with a developer Xbox One tonight at the Xbox One Tour in London. I was able to run the acid and html5 tests as well as supportdetails.com and get these details.

Overall, it felt pretty good, and the snap/multi-screen/really fast switching feature massively improved the user experience of the browser.

If I can get more details, I'll add them to other requests.