update system integration and readme

etc/systemd/system/oxdata.service

@@ -0,0 +1,23 @@
+[Unit]
+Description=oxdata daemon
+
+[Service]
+Type=simple
+Restart=always
+User=oxdata
+Group=oxdata
+PIDFile=/run/oxdata/oxdata.pid
+WorkingDirectory=/srv/oxdata/oxdata
+StandardOutput=syslog
+StandardError=syslog
+ExecReload=/bin/kill -HUP $MAINPID
+ExecStart=/srv/oxdata/bin/gunicorn \
+    wsgi:application \
+    -p /run/oxdata/oxdata.pid \
+    --bind 0.0.0.0:8087 \
+    --workers 5 \
+    --max-requests 1000 \
+    --log-level info
+
+[Install]
+WantedBy=multi-user.target