Created Systemd (markdown)

Systemd.md

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+Run `nexy` as `systemd` service.
+
+## System user
+
+1. `useradd -m nexy` - create new system user with its home directory
+2. `passwd nexy` - provide strong password
+3. `su nexy` - login as `nexy`
+4. `cd` - navigate to the home folder
+5. `mkdir /home/nexy/public` - create location for the public fies
+
+## Service configuration
+
+Create new file `/etc/systemd/system/nexy.service` with following settings:
+
+``` snac.service
+[Unit]
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=nexy
+Group=nexy
+ExecStartPre=/bin/sleep 10
+ExecStart=/usr/local/bin/nexy -p /home/nexy/public -b 0.0.0.0:1900
+StandardOutput=file:/home/nexy/debug.log
+StandardError=file:/home/nexy/error.log
+
+[Install]
+WantedBy=multi-user.target
+```
+* replace `0.0.0.0:1900` with your address, use `[300:xxxx:xxxx:xxxx::1]:1900` notation for IPv6
+* bind (`-b`) as many interfaces as desired
+* to disable debug output, set `StandardOutput` and `StandardError` as `null` or add `-d ''` option to `ExecStart`
+
+### Manage
+
+* `sudo systemctl daemon-reload` - apply new configuration
+* `sudo systemctl enable nexy` - autostart on system startup
+* `sudo systemctl restart nexy` - start the service