Add link for n8n node (#2649)

Author: twiesing

docs/docs/content/apis/sdks.md

@@ -21,3 +21,4 @@ A list of 3rd party client libraries and SDKs that have been written for listmon
 - [nuxt-listmonk](https://github.com/roncallyt/nuxt-listmonk) — Listmonk module for Nuxt.js
 - [listmonk-japi](https://codeberg.org/hlassiege/listmonk-japi) - Listmonk client for Java/kotlin
 - [listmonk-mcp](https://github.com/rhnvrm/listmonk-mcp) — MCP (Model Context Protocol) server for Claude integration
+- [N8N Nodes](https://github.com/wiesinghilker/n8n-nodes-listmonk) — Adds Listmonk Nodes for N8N Automations