Add Linux service doc and sample

.res/systemd/diun.service

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+[Unit]
+Description=Diun
+Documentation=https://github.com/crazy-max/diun
+After=syslog.target
+After=network.target
+
+[Service]
+RestartSec=2s
+Type=simple
+User=diun
+Group=diun
+ExecStart=/usr/local/bin/diun --config /etc/diun/diun.yml --log-level info
+Restart=always
+Environment=DIUN_DB=/var/lib/diun/diun.db
+
+[Install]
+WantedBy=multi-user.target

doc/install/linux-service.md

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+# Run as service on Debian based distro
+
+## Using systemd
+
+> :warning: Make sure to follow the instructions to [install from binary](binary.md) before.
+
+Run the below command in a terminal:
+
+```
+sudo vim /etc/systemd/system/diun.service
+```
+
+Copy the sample [diun.service](../../.res/systemd/diun.service).
+
+Change the user, group, and other required startup values following your needs.
+
+Enable and start Diun at boot:
+
+```
+sudo systemctl enable diun
+sudo systemctl start diun
+```
+
+To view logs:
+
+```
+journalctl -fu diun.service
+```