Update README.md

Author: abooarulraj

README.md

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 Learn how you can perform filtering in the Syncfusion Angular Tree Grid control. In this example, I explain how to enable filtering, consider diacritic characters while filtering, and filter at initial rendering. I also explain the filter hierarchy modes, filter operators, and advanced filter types.
 
+Watch the video now: https://www.syncfusion.com/tutorial-videos/angular/treegrid?title=how-to-work-with-filtering-options-in-angular-tree-grid
+
 Documentation: https://ej2.syncfusion.com/angular/documentation/treegrid/filtering