Improve model card

This PR adds the metadata for the paper [SFT Memorizes, RL Generalizes: A Comparative Study of Foundation Model Post-training](https://huggingface.co/papers/2501.17161).

The metadata includes the license, library name, pipeline tag, and code repository.

Please review and merge this PR if everything looks good.

README.md

@@ -1,3 +1,10 @@
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-license: apache-2.0
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+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: text-generation
+---
+
+This repository contains the model of 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