Update README.md

Author: cszn

model_zoo/README.md

@@ -1,5 +1,58 @@
 model_zoo
 
+
+
+download all the models:
+```
+python main_download_pretrained_models.py --models "all"  --model_dir "model_zoo"
+```
+download DnCNN models:
+```
+python main_download_pretrained_models.py --models "DnCNN" --model_dir "model_zoo"
+```
+download SRMD models:
+```
+python main_download_pretrained_models.py --models "SRMD" --model_dir "model_zoo"
+```
+download BSRGAN models:
+```
+python main_download_pretrained_models.py --models "BSRGAN" --model_dir "model_zoo"
+```
+download FFDNet models:
+```
+python main_download_pretrained_models.py --models "FFDNet" --model_dir "model_zoo"
+```
+download DPSR models:
+```
+python main_download_pretrained_models.py --models "DPSR" --model_dir "model_zoo"
+```
+download SwinIR models:
+```
+python main_download_pretrained_models.py --models "SwinIR" --model_dir "model_zoo"
+```
+download other models:
+```
+python main_download_pretrained_models.py --models "others" --model_dir "model_zoo"
+```
+------------------------------------------------------------------
+download 'dncnn_15.pth' and 'dncnn_50.pth'
+```
+python main_download_pretrained_models.py --models "dncnn_15.pth dncnn_50.pth" --model_dir "model_zoo"
+```
+------------------------------------------------------------------
+download DnCNN models and 'BSRGAN.pth'
+```
+python main_download_pretrained_models.py --models "DnCNN BSRGAN.pth" --model_dir "model_zoo"
+```
+
+
+
+
+
+
+------------------------------------------------------------------
+
+
 *  Github download link: https://github.com/cszn/KAIR/releases/tag/v1.0
 *  Google drive download link: [https://drive.google.com/drive/folders/13kfr3qny7S2xwG9h7v95F5mkWs0OmU0D?usp=sharing](https://drive.google.com/drive/folders/13kfr3qny7S2xwG9h7v95F5mkWs0OmU0D?usp=sharing)