add simple installer/uninstaller

ServerSelector/Views/MainView.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="clr-namespace:ServerSelector.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="370" d:DesignHeight="170"
+             x:Class="ServerSelector.Views.MainView"
+             x:DataType="vm:MainViewModel"
+			 >
+  <Design.DataContext>
+    <!-- This only sets the DataContext for the previewer in an IDE,
+         to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+    <vm:MainViewModel />
+  </Design.DataContext>
+
+	<StackPanel>
+		<WrapPanel Margin="5">
+			<TextBlock VerticalAlignment="Center" Margin="5">Game path: </TextBlock>
+			<TextBox x:Name="txtGamePath">C:\NIKKE\NIKKE\game</TextBox>
+		</WrapPanel>
+
+		<WrapPanel Margin="5">
+			<TextBlock VerticalAlignment="Center" Margin="5">Launcher path: </TextBlock>
+			<TextBox x:Name="txtLauncherPath">C:\NIKKE\Launcher</TextBox>
+		</WrapPanel>
+
+
+		<WrapPanel Margin="5">
+			<TextBlock VerticalAlignment="Center" Margin="5">Server: </TextBlock>
+
+			<ComboBox SelectedIndex="0" x:Name="CmbServerSelection">
+				<ComboBox.Items>
+					<ComboBoxItem>Official</ComboBoxItem>
+					<ComboBoxItem>Local</ComboBoxItem>
+				</ComboBox.Items>
+			</ComboBox>
+		</WrapPanel>
+
+		<Button HorizontalAlignment="Right" Margin="5" Click="Save_Click">Save</Button>
+	
+	</StackPanel>
+</UserControl>

ServerSelector/Views/MainView.axaml.cs

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+using Avalonia.Controls;
+using System;
+using System.Runtime.InteropServices;
+using System.Security.Principal;
+
+namespace ServerSelector.Views;
+
+public partial class MainView : UserControl
+{
+    public MainView()
+    {
+        InitializeComponent();
+        CmbServerSelection.SelectedIndex = ServerSwitcher.IsUsingOfficalServer() ? 0 : 1;
+    }
+
+    private void Save_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        try
+        {
+            ServerSwitcher.SaveCfg(CmbServerSelection.SelectedIndex == 0, txtGamePath.Text, txtLauncherPath.Text);
+        }
+        catch(Exception ex)
+        {
+            ShowWarningMsg("Failed to save configuration: " + ex.ToString(), "Error");
+        }
+    }
+
+    // for some stupid reason avalonia does not support message boxes.
+
+    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
+    public static extern int MessageBox(IntPtr hWnd, String text, String caption, uint type);
+
+    public static void ShowWarningMsg(string text, string title)
+    {
+        MessageBox(IntPtr.Zero, text, title, 0x00000030);
+    }
+}

ServerSelector/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:ServerSelector.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:ServerSelector.Views"
+        mc:Ignorable="d" d:DesignWidth="370" d:DesignHeight="170"
+        x:Class="ServerSelector.Views.MainWindow"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="Server Switcher Utility" Width="370" Height="170" CanResize="False">
+        <views:MainView />
+</Window>

ServerSelector/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace ServerSelector.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}