Fixed typo in the C# code.

```csharp
        ...  
        appBuilder
            .UseMauiApp<App>()
            .ConfigureGraphicsControls()); //Here removed the extra ')'
        ...
    }
}
```

README.md

@@ -41,7 +41,7 @@ public static class MauiProgram
 
         appBuilder
             .UseMauiApp<App>()
-            .ConfigureGraphicsControls());
+            .ConfigureGraphicsControls();
 
         return appBuilder.Build();
     }