Consider moving QSG to its own sub page

[srl295]

Move the QSG off to QUICKSTART.md or something.
If we do this, we should keep the header in README.md so URLs don't break.

[srl295]

see #2

@yumaoka to review

[srl295]

Oops - I didn't actually open a PR here. This should be verified before being reopened.