Create outline of first class

[marianoguerra]

we can start here and later move it somewhere else

[marianoguerra]

migrate some of this content to thimble:

http://docs.railsbridge.org/frontend/

[marianoguerra]

one file per step, tutorial tells you to switch files, add activities for each step if it makes sense (for example, change name to your name, add/remove words etc)

[marianoguerra]

also ask user to do a thing that is later shown in the next, tell them to try and see the next file when ready (or tired :P)