Modified the readme content

Author: Backiaraj

README.md

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 A quick-start project that helps you customize Syncfusion Blazor TreeView items easily using a template and the CssClass property in a WebAssembly app. You will learn how to use the context property and access the data fields showcasing the employee details with their images and designations.
 
 **Documentation**: https://blazor.syncfusion.com/documentation/treeview/template 
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 **Online example**: https://blazor.syncfusion.com/demos/treeview/template
 
 ## Prerequisites