Add systemd unit file for goemaxima

goemaxima.service

+[Unit]
+Description=GoeMaximaPool Docker Image Thing
+After=network-online.target
+Wants=network-online.target
+After=remote-fs.target
+
+[Service]
+ExecStartPre=-/usr/bin/docker kill goemaximapool
+ExecStart=/usr/bin/docker run --rm --name goemaximapool --publish 0.0.0.0:8080:80 goemaxima:2020120600-dev
+
+[Install]
+WantedBy=multi-user.target
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