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

Author: SreemonPremkumarM

README.md

@@ -1,2 +1,59 @@
-# How to customize tree nodes using data template selector in wpf treeview?
-This repository describes how to customize tree nodes using data template selector in wpf treeview
+# How to customize tree nodes using data template selector in WPF TreeView
+
+This repository describes how to customize tree nodes using data template selector in [WPF TreeView](https://www.syncfusion.com/wpf-controls/treeview) (SfTreeView)
+
+The TreeView allows you to customize the appearance of each item with different templates based on specific constraints by using the [ItemTemplateSelector](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_ItemTemplateSelector). You can choose a [DataTemplate](https://docs.microsoft.com/en-us/dotnet/api/system.windows.datatemplate?view=netcore-3.1) for each item at runtime based on the value of data-bound property using `ItemTemplateSelector`.
+
+#### XAML
+
+``` xml
+<Window x:Class="NodeWithImageDemo.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:NodeWithImageDemo"
+        xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
+        mc:Ignorable="d">
+
+    <Window.DataContext>
+        <local:FileManagerViewModel/>
+    </Window.DataContext>
+    <Window.Resources>
+        <local:ItemTemplateSelector x:Key="itemTemplateSelector"/>
+    </Window.Resources>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition/>
+        </Grid.RowDefinitions>
+
+        <syncfusion:SfTreeView x:Name="sfTreeView" 
+		                       Grid.Row="1"
+                               ChildPropertyName="SubFiles"
+                               FullRowSelect="True"
+                               ItemTemplateDataContextType="Node"
+                               ItemsSource="{Binding ImageNodeInfo}" 
+							   ItemTemplateSelector="{StaticResource itemTemplateSelector}" >
+        </syncfusion:SfTreeView>
+    </Grid>
+</Window>
+```
+
+#### C#
+
+``` csharp
+class ItemTemplateSelector : DataTemplateSelector
+{
+    public override DataTemplate SelectTemplate(object item, DependencyObject container)
+    {
+        var treeviewNode = item as TreeViewNode;
+        if (treeviewNode == null)
+            return null;
+        if (treeviewNode.Level == 0)
+            return Application.Current.MainWindow.FindResource("RootTemplate") as DataTemplate;
+        else
+            return Application.Current.MainWindow.FindResource("ChildTemplate") as DataTemplate;
+    }
+}
+```