add citation (huggingface#124)

* add citation * Update README.md Co-authored-by: Leandro von Werra <lvwerra@users.noreply.github.com> --------- Co-authored-by: Leandro von Werra <lvwerra@users.noreply.github.com>
shizhediao · Jan 31, 2023 · 9468291 · 9468291
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@@ -107,3 +107,16 @@ The PPO implementation largely follows the structure introduced in the paper **"
 
 ### Language models
 The language models utilize the `transformers` library by 🤗 Hugging Face.
+
+## Citation
+
+```bibtex
+@misc{vonwerra2022trl,
+  author = {Leandro von Werra and Younes Belkada and Lewis Tunstall and Edward Beeching and Tristan Thrush and Nathan Lambert},
+  title = {TRL: Transformer Reinforcement Learning},
+  year = {2020},
+  publisher = {GitHub},
+  journal = {GitHub repository},
+  howpublished = {\url{https://github.com/lvwerra/trl}}
+}
+```