ES-975464 - Resolve the ReadMe file length issue in this sample repository

Author: SreemonPremkumarM

README.md

@@ -1,7 +1,9 @@
 # How to define summary rows using AttachedProperty in WPF and UWP DataGrid (SfDataGrid)?
 
-This example illustrates how to define summary rows using AttachedProperty in [WPF DataGrid](https://www.syncfusion.com/wpf-ui-controls/datagrid) (SfDataGrid).
+This example illustrates how to define summary rows using [AttachedProperty](https://learn.microsoft.com/en-us/dotnet/desktop/wpf/properties/attached-properties-overview) in [WPF DataGrid](https://www.syncfusion.com/wpf-ui-controls/datagrid) (SfDataGrid).
 
-[WPF DataGrid](https://www.syncfusion.com/wpf-ui-controls/datagrid) (SfDataGrid) provides support to show the column summary. If the DataContext of SfDataGrid is ViewModel, you can bind [SummaryColumns](http://help.syncfusion.com/cr/cref_files/wpf/Syncfusion.SfGrid.WPF~Syncfusion.UI.Xaml.Grid.GridSummaryRow~SummaryColumns.html) to a property in ViewModel using the [AttachedProperty](https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/attached-properties-overview) of type List<GridSummaryColumn>.
+[WPF DataGrid](https://www.syncfusion.com/wpf-ui-controls/datagrid) (SfDataGrid) provides support to show the column summary. If the DataContext of `SfDataGrid` is ViewModel, you can bind [SummaryColumns](http://help.syncfusion.com/cr/cref_files/wpf/Syncfusion.SfGrid.WPF~Syncfusion.UI.Xaml.Grid.GridSummaryRow~SummaryColumns.html) to a property in ViewModel using the [AttachedProperty](https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/attached-properties-overview) of type `List<GridSummaryColumn>`.
+
+Refer to the code example in the following KB article to define an `AttachedProperty` of type List<GridSummaryColumn>.
 
 KB article - [How to define summary rows using AttachedProperty in WPF and UWP DataGrid (SfDataGrid)](https://www.syncfusion.com/kb/9838/how-to-define-summary-rows-using-attached-property-in-wpf-datagrid-sfdatagrid)