add systemd files

systemdfiles/cod_stats.service

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+[Unit]
+Description=Call of Duty Statistiken lesen
+
+[Service]
+Type=simple
+ExecStart=/home/pi/cod_stats_tracker/venv/bin/python3 /home/pi/cod_stats_tracker/get_cod_stats.py
+User=pi
+
+[Install]
+WantedBy=multi-user.target

systemdfiles/cod_stats.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Timer zum Aufruf der Call of Duty Statistiken lesen
+
+[Timer]
+OnCalendar=*-*-* 00,08,16,20:00:00
+Unit=cod_stats.service
+
+[Install]
+WantedBy=multi-user.target