Add reference paper

README.md

@@ -94,4 +94,26 @@ Output:
 1) positive 0.8466
 2) neutral 0.1458
 3) negative 0.0076
+```
+
+### BibTeX entry and citation info
+
+Please cite the [reference paper](https://aclanthology.org/2020.findings-emnlp.148/) if you use this model.
+
+```bibtex
+@inproceedings{barbieri-etal-2020-tweeteval,
+    title = "{T}weet{E}val: Unified Benchmark and Comparative Evaluation for Tweet Classification",
+    author = "Barbieri, Francesco  and
+      Camacho-Collados, Jose  and
+      Espinosa Anke, Luis  and
+      Neves, Leonardo",
+    booktitle = "Findings of the Association for Computational Linguistics: EMNLP 2020",
+    month = nov,
+    year = "2020",
+    address = "Online",
+    publisher = "Association for Computational Linguistics",
+    url = "https://aclanthology.org/2020.findings-emnlp.148",
+    doi = "10.18653/v1/2020.findings-emnlp.148",
+    pages = "1644--1650"
+}
 ```