#1113 Link uml-reverse-mapper created class diagrams to readme, where needed

reactor/README.md

@@ -14,6 +14,7 @@ tags:
 ## Intent
 The Reactor design pattern handles service requests that are delivered concurrently to an application by one or more clients. The application can register specific handlers for processing which are called by reactor on specific events. Dispatching of event handlers is performed by an initiation dispatcher, which manages the registered event handlers. Demultiplexing of service requests is performed by a synchronous event demultiplexer.
 
+## Class diagram
 ![Reactor](./etc/reactor.png "Reactor")
 
 ## Applicability