[CHORE]: Create Subscriber model struct

src/model/mod.rs

 pub mod product;
+pub mod subscriber;

src/model/subscriber.rs

+
+use rocket::serde::{Deserialize, Serialize};
+use rocket::log;
+use rocket::serde::json::to_string;
+use rocket::tokio;
+use bambangshop::REQWEST_CLIENT;
+use crate::model::notification::Notification;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(crate = "rocket::serde")]
+pub struct Subscriber {
+    pub url: String,
+    pub name: String,
+}
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