Review new file creation and add to project

[mlynch]

There are a few more filetypes that #144 didn't handle, namely xml and json (and others in the future). Review how to handle those other files that can be cross-platform and think of a long term strategy here

[vscaiceanu-1a]

Hi @mlynch

I've added a commit to reproduce an use-case for localizing app names for Android

victorsc/trapeze-issues@bf11d03

values-fr/strings.xml exists and the attrubutes are correctly updated.
values-de/strings.xml doesn't and the xml file isn't created on the fly.

In this case, there's no need to add the newly created file to the project (as it is the case for .strings files for iOS. If I manually add the file and rebuild my Android project I can see the localized app name.

With this fix, Trapeze will fully support white label app name localization for both iOS and Android.