Updated the README.md

README.md

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-# Switching-between-light-and-dark-themes-in-.NET-Maui-SB
-Contains samples for switching-between-light-theme-and-dark-theme in .NET Maui SB.
+# Applying Themes in Maui Controls
+
+Syncfusion themes allow you to apply colors across all the Syncfusion controls with a uniform approach and provide a consistent look and feel to your applications. This section covers the following topics: 
+
+* Applying light and dark themes
+* Overriding the default theme
+* Creating your own theme
+
+## Applying light and dark themes
+
+By default, Syncfusion offers support for both light and dark themes through the inclusion of a [SyncfusionThemeResourceDictionary](https://help.syncfusion.com/cr/maui/Syncfusion.Maui.Themes.SyncfusionThemeResourceDictionary.html).
+
+To apply themes to your application, merge the [SyncfusionThemeResourceDictionary](https://help.syncfusion.com/cr/maui/Syncfusion.Maui.Themes.SyncfusionThemeResourceDictionary.html) item.
+
+#### Theme resource dictionary
+
+This resource dictionary includes keys and their corresponding color codes for all Syncfusion controls. Additionally, it contains the [VisualTheme](https://help.syncfusion.com/cr/maui/Syncfusion.Maui.Themes.SyncfusionThemeResourceDictionary.html#Syncfusion_Maui_Themes_SyncfusionThemeResourceDictionary_VisualTheme) property where we can declare the following two theme color values:
+
+1. MaterialLight
+2. MaterialDark
+
+#### Automatic merging
+
+When using more number of Syncfusion controls in an application, to make the process easier for merging the control style dictionaries of the controls, the [SyncfusionThemeResourceDictionary](https://help.syncfusion.com/cr/maui/Syncfusion.Maui.Themes.SyncfusionThemeResourceDictionary.html) class has been provided for automatic merging.
+
+{% highlight xaml %}
+
+<Application xmlns:base="clr-namespace:SampleBrowser.Maui.Base;assembly=SampleBrowser.Maui.Base"
+             xmlns:syncTheme="clr-namespace:Syncfusion.Maui.Themes;assembly=Syncfusion.Maui.Core"
+             x:Class="SampleBrowser.Maui.App"
+             ...>
+<Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <!-- Theme resource dictionary -->
+                <syncTheme:SyncfusionThemeResourceDictionary VisualTheme="MaterialDark"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+</Application.Resources>
+
+....
+
+</Application>
+
+{% endhighlight %}
+