Create Notification service struct skeleton.

src/controller/mod.rs

+pub mod notification;
+
 use rocket::fairing::AdHoc;
 
 pub fn route_stage() -> AdHoc {

src/controller/notification.rs

+use rocket::serde::json::Json;
+
+use bambangshop_receiver::Result;
+use crate::model::notification::Notification;
+use crate::model::subscriber::SubscriberRequest;
+use crate::service::notification::NotificationService;

src/service/mod.rs

+pub mod notification;
\ No newline at end of file

src/service/notification.rs

+use std::thread;
+
+use rocket::http::Status;
+use rocket::log;
+use rocket::serde::json::to_string;
+use rocket::tokio;
+
+use bambangshop_receiver::{APP_CONFIG, REQWEST_CLIENT, Result, compose_error_response};
+use crate::model::notification::Notification;
+use crate::model::subscriber::SubscriberRequest;
+use crate::repository::notification::NotificationRepository;
+
+pub struct NotificationService;
+
+impl NotificationService {
+}