Added configuration for testable file type "zip" for adding zip comment.

docs/sbbsunix.txt

@@ -327,6 +327,12 @@ Default Configuration (SCFG) Screen-shots
 3: Working String        Testing ZIP Integrity...
 4: Access Requirements   UNIX
 
+[Testable File Type]
+1: File Extension        zip
+2: Command Line          zip -z %f < %zzipmsg.txt
+3: Working String        Adding ZIP Comment...
+4: Access Requirements   UNIX
+
 [Testable File Type]
 1: File Extension        tgz
 2: Command Line          tar -tzf %s