#113 Event Driven Architecture

- added class diagram
- added more comments

event-driven-architecture/src/main/java/com/iluwatar/eda/handler/UserUpdatedEventHandler.java

@@ -0,0 +1,14 @@
+package com.iluwatar.eda.handler;
+
+import com.iluwatar.eda.event.UserUpdatedEvent;
+import com.iluwatar.eda.framework.Channel;
+
+/**
+ * Handles the {@link UserUpdatedEvent} message
+ */
+public class UserUpdatedEventHandler implements Channel<UserUpdatedEvent> {
+
+    public void dispatch(UserUpdatedEvent message) {
+        System.out.println("User Updated!");
+    }
+}