Added reference.

README.md

@@ -112,6 +112,7 @@ Recursive Self-improvement Suite
 - [Autonomous Evaluation and Refinement of Digital Agents](https://arxiv.org/abs/2404.06474)
 - [Best Practices and Lessons Learned on Synthetic Data for Language Models](https://arxiv.org/abs/2404.07503)
 - [Toward Self-Improvement of LLMs via Imagination, Searching, and Criticizing](https://arxiv.org/abs/2404.12253)
+- [Prover-Verifier Games improve legibility of language model outputs](https://openai.com/index/prover-verifier-games-improve-legibility)
 
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