systemd: Add a simple ggsn service file
diff --git a/contrib/openggsn.service b/contrib/openggsn.service
new file mode 100644
index 0000000..3b7d8cb
--- /dev/null
+++ b/contrib/openggsn.service
@@ -0,0 +1,8 @@
+[Unit]
+Description=OpenGGSN
+
+[Service]
+Type=simple
+Restart=always
+ExecStart=/usr/bin/ggsn -c /etc/ggsn.conf -f
+RestartSec=2