Update README.md

README.md

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 license: mit
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+AugQ-CC is an unsupervised augmented dataset for training retrievers used in `AugTriever: Unsupervised Dense Retrieval by Scalable Data Augmentation`.
+It consists of 52.4M pseudo query-document pairs based on [Pile-CommonCrawl](https://pile.eleuther.ai/paper.pdf).
+
+```
+@article{meng2022augtriever,
+  title={AugTriever: Unsupervised Dense Retrieval by Scalable Data
+Augmentation},
+  author={Meng, Rui and Liu, Ye and Yavuz, Semih and Agarwal, Divyansh and Tu, Lifu and Yu, Ning and Zhang, Jianguo and Bhat, Meghana and Zhou, Yingbo},
+  journal={arXiv preprint arXiv:2212.08841},
+  year={2022}
+}
+```