Improve model card

This PR improves the model card for the paper [LLM-Supported Natural Language to Bash Translation](https://huggingface.co/papers/2502.06858).

It adds the `library_name` and a relevant `pipeline_tag`, ensuring the model can be found at https://huggingface.co/models?pipeline_tag=text-generation.

README.md

@@ -1 +1,9 @@
-https://arxiv.org/abs/2502.06858
+---
+library_name: transformers
+license: mit
+pipeline_tag: text-generation
+---
+
+This repository contains the model described in the paper [LLM-Supported Natural Language to Bash Translation](https://arxiv.org/abs/2502.06858).
+
+The code for this paper is available at https://github.com/westenfelder/NL2SH.