Improve model card: Add pipeline tag, library name, and paper link

README.md

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 license: mit
+library_name: transformers
+pipeline_tag: text-generation
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 ### Self-Certainty Maximization: Qwen3-4B-Base trained on OpenRS
 
-This is the Qwen3-4B-Base model trained by Self-Certainty Maximization using OpenRS training set.
+This is the Qwen3-4B-Base model trained by Self-Certainty Maximization using OpenRS training set, as introduced in the paper [Co-rewarding: Stable Self-supervised RL for Eliciting Reasoning in Large Language Models](https://huggingface.co/papers/2508.00410).
 
 If you are interested in Co-rewarding, you can find more details on our Github Repo [https://github.com/tmlr-group/Co-rewarding].