This PR improves the model card for AudioX. It now includes:
- A link to the [paper](https://huggingface.co/papers/2503.10522).
- A link to the official [GitHub repository](https://github.com/ZeyueT/AudioX) and [project page](https://zeyuet.github.io/AudioX/).
- A "Sample Usage" section based on the script inference provided in the GitHub README.
- Updated metadata including the arXiv ID and relevant tags.
