Add status badge.

Author: SoftlySplinter

README.md

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 # cics-java-liberty-link
+[![Build](https://github.com/SoftlySplinter/cics-java-liberty-link/actions/workflows/java.yaml/badge.svg)](https://github.com/SoftlySplinter/cics-java-liberty-link/actions/workflows/java.yaml)
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 Sample CICS Java program showing use of the com.ibm.cics.server.invocation.CICSProgram annotation for Link to Liberty.
 
 ## License