Add model card

This PR adds a model card for the paper [SafeKey: Amplifying Aha-Moment Insights for Safety Reasoning](https://huggingface.co/papers/2505.16186).

It includes the license, library name, pipeline tag, link to the paper, code, and project page.

README.md

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+---
+license: mit
+pipeline_tag: text-generation
+library_name: transformers
+---
+
+This repository contains the model described in the paper [SafeKey: Amplifying Aha-Moment Insights for Safety Reasoning](https://huggingface.co/papers/2505.16186).
+
+Code: https://github.com/eric-ai-lab/SafeKey
+
+Project Page: https://safekeylrm.github.io