FIX::edited correct names in fxml files

changed the controller names to use the greenify packages

ADD::added button to add a vegetarian meal

only the button

src/Common/src/main/java/greenify/common/UserDTO.java

@@ -1,5 +1,9 @@
 package greenify.common;
 
+// DTO stands for Data Transfer Object.
+// is an object that carries data between processes.
+// The motivation for its use is that communication between processes is usually done
+// resorting to remote interfaces (e.g., web services), where each call is an expensive operation.
 public class UserDTO {
     private Long id;
     private String name;