Add library_name and update pipeline_tag

Hi! I'm Niels from the Hugging Face community team.

This PR improves the model card's metadata by adding `library_name: transformers` and updating the `pipeline_tag` to `text-generation`. Since this model uses the `Qwen2ForCausalLM` architecture, these additions will enable the inference widget and make the model more discoverable for users looking for text generation agents.

I've also preserved the existing performance data and citation information from the paper.

README.md

@@ -1,12 +1,13 @@
 ---
-license: mit
+base_model:
+- Qwen/Qwen2.5-1.5B-Instruct
 language:
 - en
+license: mit
 metrics:
 - accuracy
-base_model:
-- Qwen/Qwen2.5-1.5B-Instruct
-pipeline_tag: reinforcement-learning
+pipeline_tag: text-generation
+library_name: transformers
 tags:
 - agent
 - reinforcement-learning