pathPaint description added

Author: Skandar Munir Ahmed

README.md

@@ -43,6 +43,9 @@ How big the crop should be in regards to the width and height available to the c
 ### drawPath
 How the border of the crop should be painted. default DottedCropPathPainter.drawPath and SolidCropPathPainter.drawPath are provided, but you can create/provide any CustomPaint.
 
+### pathPaint
+Custom painting for the crop area border style.
+
 ### canRotate
 Whether to allow the image to be rotated.