modify file structure

README.md

@@ -7,17 +7,17 @@ license: mit
 
 The dataset is organized into the following directory structure:
 
-sony_IMX678_20240111/
-│ ├── RAW/
-│      ├── gt/
-│      │    └── Scene_Gain_Exposure_Sigma.npy
-│      ├── noisy/
-│      │    └── Scene_Gain_Exposure.npy
-│ ├── RGB/
-│      ├── gt/
-│      │    └── Scene_Gain_Exposure_Sigma.png
-│      ├── noisy/
-│      │    └── Scene_Gain_Exposure.png
+| sony_IMX678_20240111/
+│     ├── RAW/
+│          ├── gt/
+│          │    └── Scene_Gain_Exposure_Sigma.npy
+│          ├── noisy/
+│          │    └── Scene_Gain_Exposure.npy
+│     ├── RGB/
+│          ├── gt/
+│          │    └── Scene_Gain_Exposure_Sigma.png
+│          ├── noisy/
+│          │    └── Scene_Gain_Exposure.png
 
 
 ### Description