[chore:] initial splash preparation, which will not be used for now

MainWindow.axaml

@@ -3,7 +3,7 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
-        MinWidth="1000" MinHeight="600"
+        MinWidth="1000" MinHeight="600" IsVisible="False"
         x:Class="Logof_Client.MainWindow" WindowState="Maximized" Icon="assets/icon.ico"
         Title="Logof Client">
     <Border>

MainWindow.axaml.cs

@@ -17,10 +17,18 @@ public partial class MainWindow : Window
     public MainWindow()
     {
         InitializeComponent();
+        //Hide();
+
+        var s = new StartupWindow();
+        //s.Show();
+
         _instance = this;
         WindowState = WindowState.Maximized;
         Global.Load();
         Settings.Load();
+
+        //Thread.Sleep(3000);
+        //Show();
     }
 
     private async void StartAddressCheck(int addresSetID)