Update README.md

recognition/arcface_torch/README.md

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 # Distributed Arcface Training in Pytorch
 
 This is a deep learning library that makes face recognition efficient, and effective, which can train tens of millions
-identity on a single server.
+identity on a single server.  
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+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/killing-two-birds-with-one-stone-efficient/face-verification-on-ijb-c)](https://paperswithcode.com/sota/face-verification-on-ijb-c?p=killing-two-birds-with-one-stone-efficient)
 
 ## Requirements