Update README.md

Author: sathiskumarKR

README.md

@@ -9,4 +9,6 @@ Online examples: https://blazor.syncfusion.com/demos/datagrid/data-annotation?th
 # Project prerequisites
 Make sure that you have the latest versions of 'Visual Studio 2022' in your machine before starting to work on this project.
 # How to run this application?
-To run this application, you need to first clone the <code>Auto-Generate-Columns-in-Blazor-DataGrid</code> repository and then open it in Visual Studio 2022. Now, simply build and run your project to view the output.
+To run this application, you need to first clone the <code>Auto-Generate-Columns-in-Blazor-DataGrid</code> repository and then open it in Visual Studio 2022.
+Register the syncfusion license key in program.cs file, if you have any doubt check the documentation link : https://blazor.syncfusion.com/documentation/getting-started/license-key/how-to-register-in-an-application
+Now, simply build and run your project to view the output.