Update README.md

Author: Vignesh Ramesh

README.md

@@ -2,7 +2,7 @@
 
 This repository contains sample to design a circular timer using the [Syncfusion WinUI Radial Gauge](https://help.syncfusion.com/winui/radial-gauge/getting-started) control.
 
-Please refer the KB through this [link]().
+Please refer the KB through this [link](https://www.syncfusion.com/kb/13670/how-to-design-a-circular-timer-using-winui-radial-gauge-sfradialgauge).
 
 ## Syncfuion control(s)