Added Post system. Notification system

src/main/java/site/easystartup/web/notification/domian/Notification.java

@@ -0,0 +1,17 @@
+package site.easystartup.web.notification.domian;
+
+import lombok.*;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Getter
+@Setter
+@ToString
+@Entity
+public class Notification {
+    @Id
+    private long id;
+    private String text;
+    private String recipient;
+}