updated readme

README.md

@@ -120,3 +120,15 @@ Authors of the paper.
 
 ### Citation Information
 
+```
+@inproceedings{humaid2020,
+Author = {Firoj Alam, Umair Qazi, Muhammad Imran, Ferda Ofli},
+booktitle={Proceedings of the Fifteenth International AAAI Conference on Web and Social Media},
+series={ICWSM~'21},
+Keywords = {Social Media, Crisis Computing, Tweet Text Classification, Disaster Response},
+Title = {HumAID: Human-Annotated Disaster Incidents Data from Twitter},
+Year = {2021},
+publisher={AAAI},
+address={Online},
+}
+```