Add model card

This PR adds a model card for the paper [PDE-Controller: LLMs for Autoformalization and Reasoning of PDEs](https://huggingface.co/papers/2502.00963).

This includes relevant metadata such as the library name, pipeline tag and license.

README.md

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+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: text-generation
+---
+
+This repository contains the PDE-Controller model as described in [PDE-Controller: LLMs for Autoformalization and Reasoning of PDEs](https://huggingface.co/papers/2502.00963).
+
+Github repository: https://github.com/Delta-Lab-AI/PDE-Controller.
+Project Page: https://pde-controller.github.io/