Update README.md

Author: layumi

README.md

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 ![Python3.6+](https://img.shields.io/badge/python-3.6+-green.svg)
 [![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)
+[![Citations](https://img.shields.io/badge/Citations-2500%2B-brightgreen)](https://scholar.google.com/scholar?cites=270746001988088124)
+[![Stars](https://img.shields.io/github/stars/layumi/Person_reID_baseline_pytorch)](https://github.com/layumi/Person_reID_baseline_pytorch/stargazers)
 
 A tiny, friendly, strong baseline code for Object-reID (based on [pytorch](https://pytorch.org)) since 2017.