Add selectable color schemes

Models/LauncherConfig.cs

@@ -6,6 +6,8 @@ public sealed class LauncherConfig
 
     public LauncherDisplayMode DisplayMode { get; set; } = LauncherDisplayMode.CompactList;
 
+    public LauncherThemeScheme ThemeScheme { get; set; } = LauncherThemeScheme.MarkHaven;
+
     public List<LauncherItem> Items { get; set; } = [];
 }
 
@@ -42,3 +44,11 @@ public enum LauncherDisplayMode
     LargeIconWithText,
     CompactList
 }
+
+public enum LauncherThemeScheme
+{
+    MarkHaven,
+    MGETOrange,
+    System,
+    WindowsClassic
+}