Update README.md

Author: sophiegreen

append-char-container-sample/README.md

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-Append CHAR Container Sample
+# Append CHAR Container Sample
 
 This sample shows how you can use the JCICSX API to create a channel containing a CHAR container, and then append data to this container and get the output at the end. 
+
+## Pre-reqs
+
+* CICS TS V5.6 or later
+* Java SE 1.7 or later on the z/OS system
+* Java SE 1.7 or later on the workstation
+