Create README.md

Author: ArrowLuo

README.md

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+*WORK IN PROGRESS ...*
+
+The implementation of paper [**CLIP4Clip: An Empirical Study of CLIP for End to End Video Clip Retrieval**](https://arxiv.org/abs/2104.08860). 
+
+CLIP4Clip is a video-text retrieval model based on [CLIP (ViT-B/32)](https://github.com/openai/CLIP). We investigate three similarity calculation approaches: parameter-free type, sequential type, and tight type, in this work. The model achieve SOTA results on MSR-VTT, MSVC, and LSMDC by a significant margin.
+
+# Citation
+If you find CLIP4Clip useful in your work, you can cite the following paper:
+```
+@Article{Luo2021CLIP4Clip,
+  author  = {Huaishao Luo and Lei Ji and Ming Zhong and Yang Chen and Wen Lei and Nan Duan and Tianrui Li},
+  title   = {CLIP4Clip: An Empirical Study of CLIP for End to End Video Clip Retrieval},
+  journal = {arXiv preprint arXiv:2104.08860},
+  year    = {2021},
+}
+```
+
+# Acknowledgments
+Our code is based on [CLIP (ViT-B/32)](https://github.com/openai/CLIP) and [UniVL](https://github.com/microsoft/UniVL).