A good habit in order to have a common code base when developing a mobile app with multiple target platforms is to create a virtual folder in the source code folder of each mobile project. This ensures that all the common code (i.e., HTML/CSS/JS files) can be shared between several projects. In order to do this move to the source folder of the Android project and of the iOS project. Using your command-line tool, create a new virtual folder:
$ ln -s ~/the/path/to/your/source/code/common/src ~/the/path/to/your/source/code//ch01/android/assets/www $ ln -s ~/the/path/to/your/source/code/common/src ~/the/path/to/your/source/code/ch01/ios/www
Both the virtual folder link to the common base located into ~/PhoneGapProjects/PGGettinStarted/common/src, the same can be done for image and media files.