Update README.md

README.md

@@ -23,10 +23,16 @@ Sentry-Image is now open-sourced at [Sentry-Image (github repository)](https://g
 * **Point of Contact:** [contact@infimagine.com](mailto:contact@infimagine.com)
 
 ## How to Download
+You can use following codes to download the dataset：
 ```shell
 git lfs install
 git clone https://huggingface.co/datasets/InfImagine/FakeImageDataset
 ```
+You can use following codes to extract the files in each subfolder (take the *SDv15R-CC1M* subfolder in ImageData/train/SDv15R-CC1M as an example)：
+```shell
+cat SDv15R-CC1M.tar.gz.* > SDv15R-CC1M.tar.gz
+tar -xvf SDv15R-CC1M.tar.gz
+```
 
 ## Dataset Summary