added systemd service files and cronjob example

CheckAutoBackup.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Check AutoBackup
+After=syslog.target network.target
+[Service]
+RestartSec=2s
+Type=oneshot
+User=root
+Group=root
+ExecStart=/root/check_AutoBackup.sh
+[Install]
+WantedBy=multi-user.target  

CheckAutoBackup.timer

@@ -0,0 +1,7 @@
+[Unit]
+Description=Check AutoBackup Timer
+[Timer]
+Persistent=false
+OnCalendar=*-*-* 2,8,14,20:05:00
+[Install]
+WantedBy=basic.target

README.md

@@ -45,6 +45,14 @@ repos_interval[0]=21600 #sec
 repos_interval_tolerance[0]=10 #%
 ```
 #### 6. install crontab or systemd-timer
+For systemd see 
+`CheckAutoBackup.service` and `CheckAutoBackup.timer`
+
+For corntab see 
+
+```
+5 2,8,14,20 * * * /root/check_AutoBackup.sh >/dev/null 2>&
+```
 
 #### 7. optional install FTDI simple alarm