Move fxml location to resources

src/main/java/app/Main.java

@@ -24,7 +24,7 @@ public class Main extends Application {
   public void start(Stage window) throws IOException {
     window.setTitle("Hello world");
 
-    Parent document = FXMLLoader.load(getClass().getResource("./MainView.fxml"));
+    Parent document = FXMLLoader.load(getClass().getResource("/fxml/Main.fxml"));
     Scene scene = new Scene(document);
     window.setScene(scene);
     window.show();