Update README.md

README.md

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 ---
 license: mit
 ---
+If you use the dataset, cite the following paper:
+```
+@inproceedings{wang2021learn,
+  title={Climate Bot: A Machine Reading Comprehension System for Climate Change Question Answering.},
+  author={Rony, Md Rashad Al Hasan and Zuo, Ying and Kovriguina, Liubov and Teucher, Roman and Lehmann, Jens},
+  booktitle={IJCAI},
+  year={2022}
+}
+```