Updates to wiki

[Martijn Verburg]

Hi all,

I've been given access to edit the Wiki (dangerous I know) and I've added a
chunk of information there including Brian's text on the goals of the
project (not just performance!)

The wiki is here:  https://wiki.openjdk.java.net/display/valhalla/Main

Any and all feedback welcome!

CCing in Adoption group as this is the sort of service we could provide for
other groups / projects of that is helpful.

Cheers,
Martijn