made some window management changes

src/Main.cs

@@ -1,5 +1,6 @@
 using Godot;
 using System;
+using System.Diagnostics;
 
 public class Main : Node2D
 {
@@ -10,7 +11,9 @@ public class Main : Node2D
     // Called when the node enters the scene tree for the first time.
     public override void _Ready()
     {
-        
+        //window management
+        OS.WindowMaximized = OS.IsDebugBuild();
+        OS.WindowFullscreen = !OS.IsDebugBuild();
     }
 
   public override async void _Process(float delta)