Add sample link. (#2728)

Author: davidbritch

docs/user-interface/controls/contentview.md

@@ -6,6 +6,8 @@ ms.date: 08/30/2024
 
 # ContentView
 
+[![Browse sample.](~/media/code-sample.png) Browse the sample](/samples/dotnet/maui-samples/userinterface-contentview)
+
 The .NET Multi-platform App UI (.NET MAUI) <xref:Microsoft.Maui.Controls.ContentView> is a control that enables the creation of custom, reusable controls.
 
 The <xref:Microsoft.Maui.Controls.ContentView> class defines a `Content` property, of type <xref:Microsoft.Maui.Controls.View>, which represents the content of the <xref:Microsoft.Maui.Controls.ContentView>. This property is backed by a <xref:Microsoft.Maui.Controls.BindableProperty> object, which means that it can be the target of data bindings, and styled.