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

Author: SreemonPremkumarM

README.md

@@ -1,2 +1,52 @@
-# How to copy a column and paste it as a new column in wpf treegrid?
-This sample illustrates how to copy a column and paste it as a new column in wpf treegrid
+# How to copy a column and paste it as a new column in wpf treegrid
+
+This sample illustrates how to copy a column and paste it as a new column in [WPF TreeGrid](https://www.syncfusion.com/wpf-controls/treegrid).
+
+You can copy a column and paste it into a new position using the context menu option in `TreeGrid`.
+
+### XAML
+
+``` xml
+<syncfusion:SfTreeGrid.HeaderContextMenu>
+                <ContextMenu ItemsSource="{Binding Menu,Source={StaticResource viewmodel}}" >
+                    <ContextMenu.ItemContainerStyle>
+                        <Style TargetType="MenuItem">
+                            <Setter Property="Command" Value="{Binding MyCommand,Source={StaticResource viewmodel}}"></Setter>
+                            <Setter Property="CommandParameter" >
+                                <Setter.Value>
+                                    <MultiBinding Converter="{StaticResource ResourceKey=converter}">
+                                        <Binding RelativeSource="{RelativeSource Self}"/>
+                                        <Binding />
+                                    </MultiBinding>
+                                </Setter.Value>
+                            </Setter>
+                        </Style>
+                    </ContextMenu.ItemContainerStyle>
+                </ContextMenu>
+ </syncfusion:SfTreeGrid.HeaderContextMenu>
+```
+
+### C#
+
+``` c#
+private static void OnCopyColumn(object obj)
+{
+    if (obj is TreeGridColumnContextMenuInfo)
+    {
+        // The selected column is stored into CopiedColumn.
+        CopiedColumn = (obj as TreeGridColumnContextMenuInfo).Column;
+    }
+}
+
+private static void OnPasteColumn(object obj)
+{
+    if (obj is TreeGridColumnContextMenuInfo && CopiedColumn != null)
+    {
+        var grid = (obj as TreeGridColumnContextMenuInfo).TreeGrid;
+        //  Get the index for corresponding column.
+        var index = grid.Columns.IndexOf((obj as TreeGridColumnContextMenuInfo).Column);
+        // Copy the column and insert based on the index position.
+        grid.Columns.Insert(index + 1, new TreeGridTextColumn() { MappingName = CopiedColumn.MappingName });
+    }
+}
+```