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

half-sync-half-async/README.md

@@ -14,6 +14,7 @@ The Half-Sync/Half-Async pattern decouples synchronous I/O from
 asynchronous I/O in a system to simplify concurrent programming effort without
 degrading execution efficiency.
 
+## Class diagram
 ![Half-Sync/Half-Async class diagram](./etc/half-sync-half-async.png)
 
 ## Applicability