refactor: update project structure

src/main/java/sbu/javafx/Launcher.java

@@ -0,0 +1,8 @@
+package sbu.javafx;
+
+import javafx.application.Application;
+
+public class Launcher{
+    public static void main(String[] args) {
+        // TODO: Launch the JavaFX application by calling Application.launch(Main.class)    }
+}

src/main/java/sbu/javafx/MusicApp.java

@@ -20,8 +20,4 @@ public class MusicApp extends Application {
         stage.show();
     }
 
-    public static void main(String[] args)
-    {
-        launch();
-    }
 }