responsive_extentsion/core library

1. flutter_responsive_extension package
2. documentation
3. responsive_extentsion/core.dart

flutter_responsive_extension package

1. Libraries
2. flutter_responsive_extension
3. responsive_extentsion/core
4. responsive_extentsion/responsive_enums
5. responsive_extentsion/responsive_extension
6. responsive_extentsion/responsive_widget