add docker-service.sh with example for manually adding a service to an existing lb

docker-service.sh

@@ -0,0 +1,8 @@
+docker service create -t \
+	--constraint "node.hostname == ${NOD_HOSTNAME}" \
+	--network $SWARM_NETWORK \
+	--name  explorer \
+	--hostname explorer.beta.z.cash \
+	--label traefik.port=3001 \
+	--label traefik.frontend.rule='Host:explorer.beta.z.cash;' \
+	ianamunoz/insight-explorer-zcash:v1.1.1