add cloudflare and documentation

contrib/safelineapi.env

@@ -0,0 +1,12 @@
+## Example environment file for systemd (placed at /etc/default/safelineapi)
+## Values here are sourced by the systemd unit via EnvironmentFile
+# Path to config.json
+CONFIG_PATH=/opt/safelineapi/config.json
+
+# Optional runtime overrides
+#SAFELINE_API_TOKEN=
+#DNS_PROVIDER=Cloudflare
+#CONTACT_EMAIL=you@example.com
+
+# Path to binary (if you installed somewhere else)
+#BIN=/opt/safelineapi/safelineApi

contrib/safelineapi.service

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+[Unit]
+Description=SafelineAPI Service
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/safelineapi
+ExecStart=/opt/safelineapi/safelineApi
+Restart=on-failure
+RestartSec=5
+EnvironmentFile=/etc/default/safelineapi
+User=safeline
+Group=safeline
+
+[Install]
+WantedBy=multi-user.target