Update README.md

Add paper link and reference format

README.md

@@ -227,3 +227,14 @@ configs:
   - split: test
     path: toolbench/test-*
 ---
+
+* StreamBench paper link: https://arxiv.org/abs/2406.08747 (The links for the original raw datasets on StreamBench can be found in Appendix F)
+* If you find our work helpful, please cite as:
+```
+@article{wu2024streambench,
+  title={StreamBench: Towards Benchmarking Continuous Improvement of Language Agents},
+  author={Wu, Cheng-Kuang and Tam, Zhi Rui and Lin, Chieh-Yen and Chen, Yun-Nung and Lee, Hung-yi},
+  journal={arXiv preprint arXiv:2406.08747},
+  year={2024}
+}
+```