added getting started to the readme

Gave two paths:
 * A cordova project
 * A raw iOS project 

@stoodder @joshdholtz 
i'd rather have the "getting started" tutorial call it out as a thing to do. **assumption:** most people who are coding raw iOS wrappers aren't going to put their web code in the root of their directory next to their .xcodeproj - usually this code goes in ./Resources