added logger

src/de/miaurizius/jgame2d/core/Boot.java

@@ -1,10 +1,13 @@
 package de.miaurizius.jgame2d.core;
 
 import javax.swing.*;
+import java.util.logging.Logger;
 
 public class Boot {
 
-    public static void main() {
+    public static final Logger logger = Logger.getLogger("JDGame2D");
+
+    static void main() {
         JFrame window = new JFrame();
         window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
         window.setResizable(false);