#113 Event Driven Architecture

- added class diagram
- added more comments

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

@@ -0,0 +1,7 @@
+package com.iluwatar.eda.event;
+
+/**
+ * @author cfarrugia
+ */
+public class UserCreatedEvent extends Event {
+}