DOC updates [skip ci]

updated README.md
update CONTRIBUTING.md
add docs/getting_started_on_windows.md
[skip ci]
Rbenv isn't a supported option for me. But if it doesn't make a difference in our script I'm fine with it.

Sent from my iPhone

> On Jun 28, 2014, at 12:49 PM, "Rigel St. Pierre" <notifications@github.com> wrote:
> 
> In CONTRIBUTING.md:
> 
> > @@ -118,51 +117,38 @@ There's only a VirtualBox basebox right now.
> >      Now that you're SSH'ed into the Vagrant VM it's time to run the app.
> >  
> >          # we're still SSH'ed into Vbox
> > -        cd ~/web
> > +        cd ~/assemblymade
> >          rvm current # should be ruby-2.1.0@coderwall
> I'd suggest changing this as people may be using rbenv
> 
> —
> Reply to this email directly or view it on GitHub.