added dummy implementation for get and delete mail

application/module-mail/src/main/java/org/fuseri/modulemail/service/MailService.java

@@ -18,6 +18,17 @@ public class MailService {
         message.setText(dto.content);
 
         emailSender.send(message);
+        // store to database once there is one
+
         return "Success, you have sent: " + dto.content;
     }
+
+    public EmailDto getMail(long id) {
+        return new EmailDto("","",""); // return from database once there is one
+    }
+
+    public String DeleteMail (long id) {
+        return "No mail with that Id";
+    }
+
 }