Update README.md

README.md

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 license: cc-by-nc-4.0
+language:
+- en
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+
+The ESConv dataset. [GitHub repo](https://github.com/thu-coai/Emotional-Support-Conversation). [Original paper](https://arxiv.org/abs/2106.01144).
+
+```bib
+@inproceedings{liu-etal-2021-towards,
+  title={Towards Emotional Support Dialog Systems},
+  author={Liu, Siyang  and 
+    Zheng, Chujie  and 
+    Demasi, Orianna  and 
+    Sabour, Sahand  and 
+    Li, Yu  and 
+    Yu, Zhou  and 
+    Jiang, Yong  and 
+    Huang, Minlie},
+  booktitle={ACL},
+  year={2021}
+}
+```