add basic game window

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Millions.java

@@ -1,7 +1,24 @@
 package edu.ntnu.idi.idatt2003.gruppe42;
 
-public class Millions {
-  public static void main(String[] args) {
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.layout.BorderPane;
+import javafx.stage.Stage;
+
+public class Millions extends Application {
+
+  @Override
+  public void start(Stage stage) throws Exception {
+    BorderPane root = new BorderPane();
+    Scene scene = new Scene(root, 900, 700);
 
+    stage.setTitle("Millions");
+    stage.setScene(scene);
+    stage.setFullScreen(true);
+    stage.show();
+  }
+
+  public static void main(String[] args) {
+    launch(args);
   }
 }