#16 create MainFXML with skeletal structure

src/main/java/ch/zhaw/gartenverwaltung/MainFXMLController.java

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+package ch.zhaw.gartenverwaltung;
+
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.fxml.FXMLLoader;
+import javafx.fxml.Initializable;
+import javafx.scene.Node;
+import javafx.scene.control.Button;
+import javafx.scene.layout.AnchorPane;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.Objects;
+import java.util.ResourceBundle;
+
+public class MainFXMLController implements Initializable {
+
+    @FXML
+    private Button home_button;
+
+    @FXML
+    private AnchorPane mainPane;
+
+    @FXML
+    private Button myPlants_button;
+
+    @FXML
+    private Button mySchedule_button;
+
+    @FXML
+    private Button plants_button;
+
+    @FXML
+    void goToHome(ActionEvent event) throws IOException {
+        loadPane("Home.fxml");
+        styleChangeButton(home_button);
+    }
+
+    @FXML
+    void goToMyPlants(ActionEvent event) throws IOException {
+        loadPane("MyPlants.fxml");
+        styleChangeButton(myPlants_button);
+    }
+
+    @FXML
+    void goToMySchedule(ActionEvent event) throws IOException {
+        loadPane("MySchedule.fxml");
+        styleChangeButton(mySchedule_button);
+    }
+
+    @FXML
+    void goToPlants(ActionEvent event) throws IOException {
+        loadPane("Plants.fxml");
+        styleChangeButton(plants_button);
+    }
+
+    /**
+     * Updates the mainPane with the selected fxml file.
+     * set HGrow and VGrow to parent AnchorPane.
+     * Sends MainController to other Controllers.
+     * @param fxmlFile string of fxml file
+     * @throws IOException exception when file does not exist
+     */
+    public void loadPane(String fxmlFile) throws IOException {
+        //ToDo HGrow and VGrow of new node
+        Node node;
+        FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
+        node = (Node)loader.load();
+        if(fxmlFile.equals("MyPlants.fxml")) {
+            MyPlantsController myPlantsController = loader.getController();
+            myPlantsController.getMainController(this);
+        }
+        mainPane.getChildren().setAll(node);
+    }
+
+    private void styleChangeButton(Button button) {
+        //ToDo changeStyle of the menu buttons
+    }
+
+    /**
+     * loads the default FXML File
+     * {@inheritDoc}
+     */
+    @Override
+    public void initialize(URL url, ResourceBundle resourceBundle) {
+        try {
+            loadPane("Home.fxml");
+            styleChangeButton(home_button);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}
+