Added javadoc

src/main/java/com/release11/klaus/controller/KlausController.java

@@ -22,6 +22,11 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.UUID;
 
+
+/**
+ * A class responds to generated message uri's requests.
+ * It deletes or fetches the requested message
+ */
 @Controller("/")
 @Slf4j
 //@Profile({"DEV", "default"})