Add Android app

drip-android-observer-master/.gitignore

drip-android-observer-master/Android/.gitignore

drip-android-observer-master/Android/app/.gitignore

drip-android-observer-master/Android/app/build.gradle

drip-android-observer-master/Android/app/proguard-rules.pro

...-observer-master/Android/app/src/main/AndroidManifest.xml

...ver-master/Android/app/src/main/ic_launcher-playstore.png

...-observer-master/Android/app/src/main/ic_launcher-web.png

...src/main/java/org/dripdronescanner/android/Constants.java

...in/java/org/dripdronescanner/android/PermissionUtils.java

...ava/org/dripdronescanner/android/app/AircraftMapView.java

...a/org/dripdronescanner/android/app/AircraftViewModel.java

.../java/org/dripdronescanner/android/app/DebugActivity.java

...ava/org/dripdronescanner/android/app/DetailViewModel.java

...rg/dripdronescanner/android/app/DeviceDetailFragment.java

...ain/java/org/dripdronescanner/android/app/DeviceList.java

...va/org/dripdronescanner/android/app/SettingsActivity.java

.../java/org/dripdronescanner/android/app/TimerLiveData.java

...ava/org/dripdronescanner/android/data/AircraftObject.java

...org/dripdronescanner/android/data/AuthenticationData.java