This PR significantly enhances the model card for the GAS model by:
- Adding the `pipeline_tag: unconditional-image-generation` to the metadata, enabling better discoverability on the Hugging Face Hub.
- Providing a comprehensive description of the model, summarizing its core contributions from the paper.
- Including a direct link to the GitHub repository for easy access to the code.
- Adding a "How to use" section with an official inference code snippet, making it easier for users to get started with the trained model.
Please review and merge this update.
