update readme

README.md

@@ -32,4 +32,21 @@ This isn't super secure, probably not even as secure as Hashicorp Vault running
 
 ## Systemd script
 
+Create/update the systemd service definition at /etc/systemd/system/ccsecrets.service and then run systemctl daemon-reload
+```
+[Unit]
+Description=CC Secrets Service
+After=network.target
+#StartLimitIntervalSec=0
+
+[Service]
+Type=simple
+Restart=always
+RestartSec=1
+User=root
+ExecStart=/srv/ccsecrets/ccsecrets
+
+[Install]
+WantedBy=multi-user.target
+```
 ## API