Update README.md

README.md

@@ -24,7 +24,8 @@ CSDI/
 │ ├── cataract_002.jpg
 │ └── ...
 ├── CSDI_annotations.csv # Annotation CSV file (UTF-8 encoded)
-└── README.md # Dataset description
+├── README.md                  # Dataset description
+└── LICENSE                    # Dataset license (CC BY-NC 4.0)
 ```