Updated blog link

Author: LavanyaA

README.md

@@ -2,7 +2,7 @@
 
 This repository contains a sample to synchronize multiple charts interactions on [Syncfusion Flutter Chart](https://help.syncfusion.com/flutter/cartesian-charts/getting-started) widget.
 
-Please refer the Blog through this [link]().
+Please refer the Blog through this [link](https://www.syncfusion.com/blogs/post/synchronize-multiple-flutter-charts).
 
 ## Syncfusion controls: