Update README.md

Author: GuoLanqing

README.md

@@ -33,7 +33,7 @@ pip install -r requirements.txt
 * SRD [[Training]](https://drive.google.com/file/d/1W8vBRJYDG9imMgr9I2XaA13tlFIEHOjS/view)[[Testing]](https://drive.google.com/file/d/1GTi4BmQ0SJ7diDMmf-b7x2VismmXtfTo/view)
 
 ## Pretrained models
-[ISTD]() | [ISTD+]() | [SRD]()
+[ISTD](https://drive.google.com/file/d/1bHbkHxY5D5905BMw2jzvkzgXsFPKzSq4/view?usp=share_link) | [ISTD+](https://drive.google.com/file/d/10pBsJenoWGriZ9kjWOcE4l4Kzg-F1TFd/view?usp=share_link) | [SRD]()
 
 Please download the corresponding pretrained model and modify the `weights` in `test.py`.