#113 Event Driven Architecture

- added class diagram
- added more comments

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

@@ -0,0 +1,9 @@
+package com.iluwatar.eda.event;
+
+import com.iluwatar.eda.framework.Message;
+
+public class Event implements Message {
+    public Class<? extends Message> getType() {
+        return getClass();
+    }
+}

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

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

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

@@ -0,0 +1,4 @@
+package com.iluwatar.eda.event;
+
+public class UserUpdatedEvent extends Event {
+}