New decoder file for Zimo MX600. Fits into existing Zimo structures. Decoder identification and version numbers tested against a new MX600.
In Git - see https://github.com/JMRI/JMRI/pull/1302
In Git - see https://github.com/JMRI/JMRI/pull/1302