Moved the Emgu CV initialization code from MainPage.xaml.cs to App.xaml.cs

Emgu.CV.Example/MAUI/MauiDemoApp/App.xaml.cs

@@ -5,6 +5,8 @@
         public App()
         {
             InitializeComponent();
+
+            Emgu.CV.Platform.Maui.MauiInvoke.Init();
         }
 
         protected override Window CreateWindow(IActivationState? activationState)

Emgu.CV.Example/MAUI/MauiDemoApp/MainPage.xaml.cs

@@ -18,7 +18,7 @@ namespace MauiDemoApp
         {
             InitializeComponent();
 
-            Emgu.CV.Platform.Maui.MauiInvoke.Init();
+            
 #if DEBUG
             CvInvoke.LogLevel = LogLevel.Verbose; //LogLevel.Debug;
 #endif

cmake/Emgu.CV.runtime.maui.Package.README.md.in

@@ -12,10 +12,10 @@ Release note can be found at
 
 ## Setup
 
-Please make sure to call `Emgu.CV.Platform.Maui.MauiInvoke.Init()` before making any other calls to Emgu CV library in MAUI. You can put that in your MainPage.xaml.cs file:
+Please make sure to call `Emgu.CV.Platform.Maui.MauiInvoke.Init()` before making any other calls to Emgu CV library in MAUI. You can put that in your App.xaml.cs file:
 
 ```csharp
-    public MainPage()
+    public App()
     {
         InitializeComponent();