Add model card

This PR adds a model card linking to the paper [SFT Memorizes, RL Generalizes: A Comparative Study of Foundation Model Post-training](https://huggingface.co/papers/2501.17161),
as well as specifying the correct pipeline and library for the model. The code repository is also included in the model card.

README.md

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+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: image-text-to-text
+---
+
+This repository contains the model described in the paper [SFT Memorizes, RL Generalizes: A Comparative Study of Foundation Model Post-training](https://huggingface.co/papers/2501.17161).
+
+Project page: https://tianzhechu.com/SFTvsRL/
+
+Code: https://github.com/LeslieTrue/SFTvsRL