Add model card

This PR adds a model card for the paper [RADLADS: Rapid Attention Distillation to Linear Attention Decoders at Scale](https://huggingface.co/papers/2505.03005).
It adds the pipeline tag, library name, license, and a link to the Github repository.

README.md

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+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: text-generation
+---
+
+This repository contains the model described in [RADLADS: Rapid Attention Distillation to Linear Attention Decoders at Scale](https://huggingface.co/papers/2505.03005).
+
+Github: https://github.com/recursal/RADLADS