Updated the readme file.

README.md

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 This sample loads [Datagrid](https://help.syncfusion.com/wpf/datagrid/getting-started) and [Chromeless Window](https://help.syncfusion.com/wpf/chromeless-window/getting-started) with `MaterialDark` theme look which has been applied using SkinManager [VisualStyle](https://help.syncfusion.com/wpf/themes/skin-manager#set-visual-style) property. Also, it provides drop down options using [ComboBox](https://docs.microsoft.com/en-us/dotnet/api/system.windows.controls.combobox?view=netcore-3.1) to change themes at run time.
 
 ![Datagrid with custom theme](Images/Output.png)
+
+This sample demonstrates dynamic theme switching at runtime using Syncfusion's SkinManager in WPF applications.
+
+# Overview
+
+The application showcases:
+
+* [Datagrid](https://help.syncfusion.com/wpf/datagrid/getting-started) with MaterialDark theme applied by default
+* [Chromeless Window](https://help.syncfusion.com/wpf/chromeless-window/getting-started) for modern borderless UI
+* Runtime theme switching via dropdown ComboBox
+* Multiple theme options (Material, Office2019, Fluent, etc.)
+
+Themes are applied using SkinManager's VisualStyle property, enabling seamless theme changes without application restart.
+
+# Features
+
+* Pre-loaded MaterialDark theme on startup
+* ComboBox control for theme selection
+* Instant theme switching across all Syncfusion controls
+* Support for multiple built-in themes
+* Chromeless window with custom theming
+* DataGrid with theme-aware styling
+
+# Prerequisites
+
+* Visual Studio 2019 or later
+* .NET Framework 4.6+ or .NET 8.0+
+* Syncfusion Essential Studio for WPF
+
+# Quick Start
+
+* Clone the repository
+* Open solution in Visual Studio
+* Restore NuGet packages
+* Run the application
+* Use the dropdown to switch themes
+
+# Theme Options
+
+* MaterialLight / MaterialDark
+* Office2019Colorful / Office2019Black
+* FluentLight / FluentDark