Add docs on CF proxy

cmd/audiusd/README.md

@@ -52,6 +52,22 @@ For this to function correctly, the following conditions must be met:
 - Your service must be publicly accessible via the URL specified in the `creatorNodeEndpoint` environment variable.
 - Your service must be reachable on both port `:80` and port `:443`
 
+**CLOUDFLARE PROXY**
+
+If you are using Cloudflare Proxy, and want to use auto TLS, you have two options:
+
+1. Start with DNS-only mode:
+   - Configure Cloudflare in DNS-only mode initially (not proxied)
+   - Let the node obtain its LetsEncrypt certificate (requires HTTP access)
+   - Once certificate is obtained, you can enable Cloudflare proxy
+
+2. Use Flexible SSL mode:
+   - Set Cloudflare SSL/TLS encryption mode to "Flexible" or "Off"
+   - Wait for the node to obtain its certificate
+   - Switch Cloudflare encryption mode to "Full" once complete
+
+See Cloudflare [ssl-mode docs](https://developers.cloudflare.com/ssl/origin-configuration/ssl-modes/) for more details.
+
 ## Development
 
 ```