Add pipeline tag, library name, paper and code link

This PR improves the model card by adding:

* The `pipeline_tag` (question-answering) and `library_name` (transformers) to the metadata.
* A link to the paper.
* A link to the Github repository.

README.md

@@ -1,3 +1,11 @@
----
-license: apache-2.0
----
+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: question-answering
+---
+
+# SimpleRL-Zoo: Investigating and Taming Zero Reinforcement Learning for Open Base Models in the Wild
+
+This model is part of the [SimpleRL-Zoo](https://huggingface.co/collections/hkust-nlp/simplerl-zoo-67e0fd24c185423c1e3452d1) collection, and was presented in the paper [SimpleRL-Zoo: Investigating and Taming Zero Reinforcement Learning for Open Base Models in the Wild](https://huggingface.co/papers/2503.18892).
+
+The GitHub repository for the project can be found [here](https://github.com/hkust-nlp/simpleRL-reason/tree/v1).