I'd like to get this working too, since I know a lot of folks are happy with it for ag and ack. rg does have a --vimgrep option that should make it as easy as ag to use, but I don't think there is a proper integration just yet.
I like ripgrep quite a bit from trying it today, and am hoping to find time to work on a Vim plugin this weekend. No promises, but I'll share as soon as I have something usable.
That's fantastic! Please don't hesitate to file an issue if you run into problems.