* [Android] added (DEV) to dev flavor app name
* [Android] added `applicationIdSuffix` instead of explicit `applicationId`
* [Android] removed main/res for app to be able to see flavored resources
* replaced `flutter_launcher_icons` with `icons_launcher`
* [Android] generated icon for dev & prod flavors
* Create README.md
* [iOS] generated icons for dev & prod flavors
* [iOS] added (DEV) to dev flavor app name
* [iOS] cleanup