Create script to generate screen component/config js file 

Have the screens dictionary in :  https://github.com/hgale/BrownFieldExample/blob/master/src/const.js#L18

be moved into a js file generated by scripts/sceens. The idea here is that the developer would not need to do any manual coding, just run a scripts/screens or compile the iOS/Android app (scripts/screens is run on post install)