Added air_drawing demo (a sample for hand landmark detection solution)

[shubham0204]

This PR adds a new creative demo for the hand landmark detection solution offered by MediaPipe. With this sample, users can draw 'in the air' where the position of the fingers is provided by MediaPipe. This sample depicts the creative use of hand landmark detection and has the following features:

1. The sample is inspired by the existing hand_landmarker sample and follows most of its design. MediaPipe tasks are downloaded with download_tasks.gradle and uses CameraX for handling camera interactions.
2. The UI of the app is written entirely with Jetpack Compose, which is Android's recommended framework for building UIs.
3. The project is well-documented and follows best practices for Android app development.

This is my first contribution to the MediaPipe ecosystem and I wish to improve the sample so as to meet the requirements of the community.

Project: shubham0204/AirDrawing_with_Mediapipe_Android

[PaulTR]

Hi Shubham! This is a really cool demo. Unfortunately we're trying to keep this sample repo restricted to official Google samples for simplicity and to make maintaining content a lot easier going forward.

I would strongly recommend that you put this example up on your own repo and write a detailed tutorial about what you did, what worked well, what trouble you ran into, and anything else that could be useful for the developer community.

With that content created, you can also submit to Google's DevLibrary (https://devlibrary.withgoogle.com/) where I'm the curator for Android content. You can also submit written tutorials to androidweekly.net.

Thanks!