Add link to Redbooks page

Author: chrispoole643

README.md

@@ -1,7 +1,9 @@
 # CICS Asynchronous API Redbooks Examples
 
 This repository holds example applications and code related to the IBM
-Redbooks. For more detail see the readme for the particular example.
+Redbooks publication [_IBM CICS Asynchronous API: Concurrent
+Processing Made Simple_][book]. For more detail see the readme for the
+particular example.
 
 ## Examples
 
@@ -13,3 +15,8 @@ asynchronous API to perform these activities concurrently.
 
 ## License
 This project is licensed under [Apache License Version 2.0](LICENSE).
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+[book]: https://www.redbooks.ibm.com/Redbooks.nsf/RedbookAbstracts/sg248411.html?Open