Updating README to reflect recent updates to Hello Android XR app

[amyZepp]

Fixes #456796017

[gemini-code-assist]

Summary of Changes

Hello @amyZepp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the documentation for the Hello Android XR application by updating its README file. The changes aim to provide a more comprehensive and visually engaging overview of the app's functionalities, ensuring that users can quickly grasp the core features and capabilities demonstrated by the sample project.

Highlights

• README Update: The README.md file has been significantly updated to better reflect the current capabilities of the Hello Android XR app. This includes adding a GIF to visually demonstrate the app and expanding the description of its features.
• Feature Documentation: New features such as 3D object rendering (specifically the Bugdroid model), material and texture overrides, animation, and dynamic object positioning are now explicitly listed in the README, providing a clearer overview of the sample's functionalities.
• Markdown Fix: A minor markdown syntax error in a link to the Android Studio Canary version has been corrected for improved readability and accuracy.

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[gemini-code-assist]

Code Review

The pull request updates the README.md file to accurately reflect the new features and capabilities of the Hello Android XR app. It includes adding an image, expanding the description of the app's functionality, detailing new implemented features like 3D object rendering and animation, and correcting a minor markdown syntax error in a URL. These changes significantly improve the documentation and clarity of the project.