add citation

blog/2024-04-19-arena-hard.md

@@ -814,6 +814,15 @@ We thank Matei Zaharia, Yann Dubois, Anastasios Angelopoulos, Lianmin Zheng, Lew
 
 ## Citation
 ```
+@misc{chiang2024chatbot,
+    title={Chatbot Arena: An Open Platform for Evaluating LLMs by Human Preference},
+    author={Wei-Lin Chiang and Lianmin Zheng and Ying Sheng and Anastasios Nikolas Angelopoulos and Tianle Li and Dacheng Li and Hao Zhang and Banghua Zhu and Michael Jordan and Joseph E. Gonzalez and Ion Stoica},
+    year={2024},
+    eprint={2403.04132},
+    archivePrefix={arXiv},
+    primaryClass={cs.AI}
+}
+
 @misc{arenahard2024,
     title = {From Live Data to High-Quality Benchmarks: The Arena-Hard Pipeline},
     url = {https://lmsys.org/blog/2024-04-19-arena-hard/},