Create examples to demonstrate best practices of Qt for Android

Create examples to demonstrate how to work with Qt for Android. The examples should cover:

• Qt to/from Java communication
• How to work with custom Android Activities
• How to use Qt services and the communication between them and Qt (with intents or remote objects)
• How to pass complex objects from Java to Qt over  JNI with serialization/de-serialization
• An example to showcase how QML can be used to show a similar modular behaviour as Android Fragments.

Note: Examples should produce clear logs that can be monitored from the Android logcat.