Added crosshair and wrote the coords of the mouse on the screen

desktop/src/com/mygdx/game/desktop/DesktopLauncher.java

@@ -8,6 +8,9 @@ public class DesktopLauncher {
 	public static void main (String[] arg) {
 		LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();
 		config.foregroundFPS = 60;
+		config.resizable = true;
+		config.width = 1280;
+		config.height = 720;
 		new LwjglApplication(new Main(), config);
 	}
 }