Added Post system. Notification system

src/main/java/site/easystartup/web/notification/event/EventHandler.java

@@ -0,0 +1,12 @@
+package site.easystartup.web.notification.event;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+
+@Target(ElementType.METHOD)
+public @interface EventHandler {
+}