更新 'README.md'

README.md

@@ -4,7 +4,9 @@ This is a VID(VINNO Image Data) read/write library for flutter.
 
 ## Getting Started
 
+```dart
 var imageData = new VidUsImageData(vidData.buffer.asUint8List());
 var frameRate = imageData.probe.frameRate;
 var vidImage = imageData.getImage(i);
 var image = Image.memory(vidImage.imageData);
+```