This PR significantly enhances the model card for the $\\pi^3$ model by:
* Adding `license: bsd-2-clause` based on the project's GitHub repository.
* Including the `pipeline_tag: image-to-3d` for better discoverability on the Hugging Face Hub.
* Specifying `library_name: pytorch`, addressing the "[More Information Needed]" note in the existing card and correctly identifying the model's primary framework.
* Providing a comprehensive overview of the model from the paper's abstract and GitHub README.
* Adding direct links to the paper, project page, GitHub repository, and a Hugging Face demo.
* Including detailed usage instructions with code snippets for quick inference.
* Adding sections for acknowledgements, citation, and license information.
These updates make the model card more informative, accessible, and aligned with Hugging Face Hub best practices.
