Update 'README.md'

README.md

@@ -1,3 +1,35 @@
 # sprinkle-scheduler
 
-A UserFrosting sprinkle to add scheduled events
+A UserFrosting sprinkle to add scheduled events.
+
+Either a crontab set to run once a minute is required or a systemd timer:
+
+Systemd service: /etc/systemd/system/uf-scheduler.service
+```systemd
+[Unit]
+Description=UserFrosting Scheduler
+
+[Service]
+Restart=no
+Type=simple
+ExecStart=/usr/bin/php bakery schedule -n
+WorkingDirectory=/srv/UserFrosting
+User=www-data
+Group=www-data
+
+[Install]
+WantedBy=multi-user.target
+```
+Systemd timer: /etc/systemd/system/uf-scheduler.timer
+```systemd
+[Unit]
+Description=UserFrosting Scheduler trigger
+
+[Timer]
+OnCalendar=*-*-* *:*:00
+Persistent=true
+Unit=uf-scheduler.service
+
+[Install]
+WantedBy=multi-user.target
+```