add 4-2-Android UI Development

android/4-2-AndroidUIDevelopment/WidgetDemo/.gitignore

...id/4-2-AndroidUIDevelopment/WidgetDemo/.idea/compiler.xml

...d/4-2-AndroidUIDevelopment/WidgetDemo/.idea/encodings.xml

android/4-2-AndroidUIDevelopment/WidgetDemo/.idea/gradle.xml

android/4-2-AndroidUIDevelopment/WidgetDemo/.idea/misc.xml

...oid/4-2-AndroidUIDevelopment/WidgetDemo/.idea/modules.xml

...droidUIDevelopment/WidgetDemo/.idea/runConfigurations.xml

android/4-2-AndroidUIDevelopment/WidgetDemo/app/.gitignore

android/4-2-AndroidUIDevelopment/WidgetDemo/app/build.gradle

...-2-AndroidUIDevelopment/WidgetDemo/app/proguard-rules.pro

...a/uwaterloo/cs347/widgetdemo/ExampleInstrumentedTest.java

...UIDevelopment/WidgetDemo/app/src/main/AndroidManifest.xml

...main/java/ca/uwaterloo/cs347/widgetdemo/MainActivity.java

.../app/src/main/res/drawable-v24/ic_launcher_foreground.xml

...Demo/app/src/main/res/drawable/ic_launcher_background.xml

...ment/WidgetDemo/app/src/main/res/layout/activity_main.xml

...etDemo/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

.../app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

...t/WidgetDemo/app/src/main/res/mipmap-hdpi/ic_launcher.png

...etDemo/app/src/main/res/mipmap-hdpi/ic_launcher_round.png