Added systemd-startup-script and short description how to install this

systemd/README.md

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+# Running the pYSFReflector as a Service
+
+Most of us will run the pYSFReflector as a service to be started automatically at system startup.
+A common way to realize this is using startup-scripts. Almost all modern Linux-systems support
+systemd-startup-system.
+
+The script you find here in this directory is such a systemd-startup-script.
+Simply copy it (as root) into /etc/systemd/system and use the following commands to make it running:
+
+`sudo systemctl enable YSFReflector.service`
+
+and for starting it initially:
+
+`sudo systemctl start YSFReflector.service`
+
+But before you start the reflector with this command keep sure to have following steps done:
+
+a) Add a group named mmdvm to your system-groups with: `sudo groupadd mmdvm`
+
+b) After this add the system-user mmdvm to your users with: `sudo useradd mmdvm -g mmdvm -s /sbin/nologin`
+
+c) make the logdir configured in your YSFReflector.ini owned by mmdvm for example like this:
+`sudo chown -R mmdvm:mmdvm /var/log/YSFReflector`
+
+Now all is prepared for starting the reflector automatically.
+
+To control the reflector's functions you could use following commands:
+
+`sudo systemctl start YSFReflector.service` starts the reflector if not running
+
+`sudo systemctl stop YSFReflector.service` stops the reflector
+
+`sudo systemctl restart YSFReflector.service` restarts a running reflector (for example after changeing YSFReflector.ini)
+
+`sudo systemctl status YSFReflector.service` shows actual running state of reflector
+

systemd/YSFReflector.service

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+[Unit]
+Description=YSFReflector
+After=network.target
+
+[Service]
+ExecStartPre=/bin/sleep 1
+Type=simple
+User=mmdvm
+Group=mmdvm
+Restart=always
+# Modify for different location of Python3 or location of files
+ExecStart=/usr/bin/python3 /usr/local/bin/YSFReflector /etc/YSFReflector/YSFReflector.ini
+
+[Install]
+WantedBy=multi-user.target