This PR adds a comprehensive model card for **SymphoMotion** to document the model, its architecture, and its usage instructions.
Specifically, this PR:
* Adds metadata including the `image-to-video` pipeline tag and `apache-2.0` license.
* Documents the model's key features and links to the official paper, project page, and GitHub repository.
* Includes installation and model download guides for quick inference.
* Adds the BibTeX citation for academic attribution.
Please feel free to merge if everything looks good!
