This PR significantly improves the model card for the RLVER model by:
- Adding `pipeline_tag: text-generation` and `library_name: transformers` to the metadata for better discoverability and integration.
- Including the paper's abstract for a comprehensive description.
- Providing links to the Hugging Face paper page, the arXiv paper, and the official GitHub repository.
- Adding a practical Python usage example for text generation using the `transformers` library.
- Including the BibTeX citation for the paper.
