added getting started to the readme

Gave two paths:
 * A cordova project
 * A raw iOS project 

@stoodder @joshdholtz 
@nickgartmann This will need some more explaining of some sort. Cordova generates a "www" folder but an normal Xcode project will not have one. That either need to be explained or it will need we will need to add some tutorial (or link to the tutorial) that shows how to set up www folder for an Xcode project. The web app also doesn't necessarily need to be in the Xcode directory. Lots of freedom :) 

Also, not sure if what I said above is clear or not