update RNcamera readme

docs/RNCamera.md

@@ -324,10 +324,17 @@ By default a `Camera not authorized` message will be displayed when access to th
 
 By default a <ActivityIndicator> will be displayed while the component is waiting for the user to grant/deny access to the camera, if set displays the passed react element instead of the default one.
 
-#### `iOS` `rectOfInterest`
+#### `rectOfInterest`
 
 An `{x: , y:, width:, height: }` object which defines the rect of interst as normalized coordinates from `(0,0)` top left corner to `(1,1)` bottom right corner.
 
+Note: Must also provide cameraViewDimensions prop for Android device
+
+### `Android` `cameraViewDimensions`
+
+An `{width:, height: }` object which defines the width and height of the cameraView. This prop is used to adjust the effect of Aspect Raio for rectOfInterest area on Android
+
+
 ### `iOS` `videoStabilizationMode`
 
 The video stabilization mode used for a video recording. The possible values are: