add SystemResizable flag to WindowCreateInfo

src/Window.cs

@@ -25,6 +25,11 @@ namespace MoonWorks
 				windowFlags |= SDL.SDL_WindowFlags.SDL_WINDOW_FULLSCREEN_DESKTOP;
 			}
 
+			if (windowCreateInfo.SystemResizable)
+			{
+				windowFlags |= SDL.SDL_WindowFlags.SDL_WINDOW_RESIZABLE;
+			}
+
 			ScreenMode = windowCreateInfo.ScreenMode;
 
 			Handle = SDL.SDL_CreateWindow(

src/WindowCreateInfo.cs

@@ -6,17 +6,20 @@
 		public uint WindowWidth;
 		public uint WindowHeight;
 		public ScreenMode ScreenMode;
+		public bool SystemResizable;
 
 		public WindowCreateInfo(
 			string windowTitle,
 			uint windowWidth,
 			uint windowHeight,
-			ScreenMode screenMode
+			ScreenMode screenMode,
+			bool systemResizable = false
 		) {
 			WindowTitle = windowTitle;
 			WindowWidth = windowWidth;
 			WindowHeight = windowHeight;
 			ScreenMode = screenMode;
+			SystemResizable = systemResizable;
 		}
 	}
 }