Update README.md

Author: syncsiva

README.md

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 # WPF DataGrid Samples
 Repository contains various WPF DataGrid samples. 
 
-1. [How to improve the performance while selecting rows using shift key in WPF DataGrid?](https://www.syncfusion.com/kb/9434/how-to-improve-the-performance-while-selecting-rows-using-shift-key)
-2. [How to wire the RowValidating event after pasted content to WPF DataGrid?](https://www.syncfusion.com/kb/9432/how-to-wire-the-rowvalidating-event-after-pasted-the-content-to-datagrid)
+1. [How to improve the performance while selecting rows using shift key in WPF DataGrid?](https://www.syncfusion.com/kb/9434/how-to-improve-the-performance-while-selecting-rows-using-shift-key) - Demo
+2. [How to wire the RowValidating event after pasted content to WPF DataGrid?](https://www.syncfusion.com/kb/9432/how-to-wire-the-rowvalidating-event-after-pasted-the-content-to-datagrid) - Demo