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

Author: SreemonPremkumarM

README.md

@@ -1,6 +1,25 @@
 # data-grid-high-contrast-theme
+
 The project demonstrates application of high contrast dark theme to the [Syncfusion DataGrid](https://www.syncfusion.com/winforms-ui-controls/datagrid) control for WinForms.
 
+To apply the high contrast theme to Syncfusion Windows Forms controls:
+
+* Add the reference of the exported theme library in the application.
+* Load the assembly using the `SkinManager`.
+* Set the `ThemeName` property of the controls to the name given to the theme library.
+
+The following code demonstrates the high contrast black theme set to the `DataGrid` control.
+
+``` c#
+//Load theme assembly into application using SkinManager
+SkinManager.LoadAssembly(typeof(HighContrastBlackTheme).Assembly);
+SfDataGrid sfDataGrid = new SfDataGrid();
+//Other code blocks to bind a data source and define columns for DataGrid
+//Apply high contrast theme to SfDataGrid
+sfDataGrid.ThemeName = "HighContrastBlackTheme";
+this.Controls.Add(sfDataGrid);
+```
+
 ## How to run the project
 
 * Checkout this project to a location in your disk.