Add Android app demo showcasing Querent plugin usage

[teogor]

Add Android App Demo for Querent Plugin

This pull request introduces a new Android app module that serves as an interactive demo for the Querent plugin. Users can explore the plugin's capabilities and functionalities through real-world examples and scenarios.

Key Features:

• Interactive interface: Users can directly interact with the plugin to perform various tasks.
• Real-world use cases: The app demonstrates the plugin's applicability in different contexts.
• Clear documentation: In-app instructions and comments guide users through the demo.

Benefits:

• Increased plugin adoption: The app provides a user-friendly way to understand and experience the Querent plugin.
• Improved documentation: The demo serves as a valuable resource for learning and promoting the plugin.
• Enhanced developer experience: Developers can easily explore and test the plugin's functionality.

To run the demo app:

1. Clone this repository.
2. Build the project using Gradle.
3. Launch the app on your Android device or emulator.