documentation updates

docker-compose/influxdb/README.md

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+# Installation
+
+TODO: ...
+
+# Best-Practices & Post-Installation
+
+## Disable HTTP
+
+It's not secure to expose InfluxDB via the HTTP protocol. Follow these steps to enable HTTPS only.
+
+### (Option 1): Upload custom certificates
+
+TODO: Not tested in Docker-Compose...
+
+- [ ] Run the container with tls parameters
+`influxd --tls-cert=/etc/ssl/cert.pem --tls-key=/etc/ssl/cert-key.pem`
+
+### (Option 2): Use a Reverse Proxy
+
+- [] Use a Reverse Proxy to securely expose administrative services.
+
+# Additional Referfences
+
+[Official InfluxDB Documentation](https://docs.influxdata.com/influxdb/v2.1/)