Created checklists for organizers, admin and instructors (also tiny change to readme)

First stab at boot camp checklists for admin, instructors and organizers. Still quite incomplete (most notably, there are no items on using the resources on github). Also need feedback on which items are most appropriate for which checklist.

Also I made a little change to the README a few days ago when I was experimenting with Git but never got around to requesting that it be pulled.