Add upstart example

Update link to example.cachet-monitor.service under Init Script section

example.cachet-monitor.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=Cachet Monitor
+After=syslog.target
+After=network.target
+#After=mysqld.service
+#After=postgresql.service
+#After=memcached.service
+#After=redis.service
+
+[Service]
+Type=simple
+User=root
+Group=root
+WorkingDirectory=/root
+ExecStart=/root/cachet-monitor -c /etc/cachet-monitor.yaml
+Restart=always
+Environment=USER=root HOME=/root
+
+[Install]
+WantedBy=multi-user.target

example.upstart.conf

@@ -0,0 +1,14 @@
+description "Cachet Monitor"
+
+start on startup
+
+env USER=root
+env HOME=/root
+
+setuid root
+setgid root
+chdir /root
+
+script
+	exec cachet-monitor -c /cachet-monitor.json --immediate
+end script

readme.md

@@ -39,6 +39,7 @@ monitors:
     metric_id: 4
 
     # custom templates (see readme for details)
+    # leave empty for defaults
     template:
       investigating:
         subject: "{{ .Monitor.Name }} - {{ .SystemName }}"
@@ -116,6 +117,14 @@ Environment varaibles:
   CACHET_DEV      set to enable dev logging
 ```
 
+## Init script
+
+If your system is running systemd (like Debian, Ubuntu 16.04, Fedora or Archlinux) you can use the provided example file: [example.cachet-monitor.service](https://github.com/CastawayLabs/cachet-monitor/blob/master/example.cachet-monitor.service).
+
+1. Simply put it in the right place with `cp example.cachet-monitor.service /etc/systemd/system/cachet-monitor.service`
+2. Then do a `systemctl daemon-reload` in your terminal to update Systemd configuration
+3. Finally you can start cachet-monitor on every startup with `systemctl enable cachet-monitor.service`! 👍
+
 ## Templates
 
 This package makes use of [`text/template`](https://godoc.org/text/template). [Default HTTP template](https://github.com/CastawayLabs/cachet-monitor/blob/master/http.go#L14)