Update README.md

Author: abooarulraj

README.md

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 A quick-start project that helps you create the Blazor Numeric Textbox of Syncfusion in a Blazor server application. This sample explains how to add prominent features like range validation, value formatting and setting decimal precision to it.
 
-Watch the video now:<coming soon>
+Watch the video now: https://www.syncfusion.com/tutorial-videos/blazor/numeric-textbox?title=create-a-numeric-textbox-in-a-blazor-server-application
 
 Documentation: https://blazor.syncfusion.com/documentation/numeric-textbox/getting-started