Create sample service file

Create sample service file for launching/restarting via systemd.
Configured by modifying User, WorkingDirectory and EnvironmentFile to reflect username and path.
File is to be moved to ```/etc/systemd/system/chibisafe.service```

chibisafe-sample.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=chibisafe, easy to use file uploader
+After=network.target
+
+[Service]
+Type=simple
+User=yourusername
+WorkingDirectory=/path/to/chibisafe
+EnvironmentFile=/path/to/chibisafe/.env
+ExecStart=/usr/bin/npm run start
+Restart=always
+
+[Install]
+WantedBy=multi-user.target