new home screen, tutorial fxml file and missing javadoc

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

@@ -81,22 +81,37 @@ public class CropDetailController {
 
     }
 
+    /**
+     * close Window
+     */
     @FXML
     void goBack() {
         Stage stage = (Stage) imageView.getScene().getWindow();
         stage.close();
     }
 
+    /**
+     * open dialog to set area
+     */
     @FXML
     void setArea() {
 
     }
 
+    /**
+     * open dialog to set location
+     */
     @FXML
     void setLocation() {
 
     }
 
+    /**
+     * set labels and image from selected {@link Crop}
+     * set icons for buttons
+     * @param crop {@link Crop} which will be displayed
+     * @throws PlantNotFoundException exception
+     */
     public void setPlantFromCrop(Crop crop) throws PlantNotFoundException {
         this.crop = crop;
         try {