Add Customer.io integration to README

README.md

@@ -159,6 +159,7 @@ Official integrations are maintained by companies building production ready MCP
 - <img height="12" width="12" src="https://avatars.githubusercontent.com/u/58433296" alt="CTERA Edge Filer" /> **[CTERA Edge Filer](https://github.com/ctera/mcp-ctera-edge)** - CTERA Edge Filer delivers intelligent edge caching and multiprotocol file access, enabling fast, secure access to files across core and remote sites.
 - <img height="12" width="12" src="https://avatars.githubusercontent.com/u/58433296" alt="CTERA Portal" /> **[CTERA Portal](https://github.com/ctera/mcp-ctera-core)** - CTERA Portal is a multi-tenant, multi-cloud platform that delivers a global namespace and unified management across petabytes of distributed content.
 - <img height="12" width="12" src="https://app.cycode.com/img/favicon.ico" alt="Cycode Logo" /> **[Cycode](https://github.com/cycodehq/cycode-cli#mcp-command-experiment)** - Boost security in your dev lifecycle via SAST, SCA, Secrets & IaC scanning with [Cycode](https://cycode.com/).
+- <img height="12" width="12" src="https://customer.io/favicon.ico" alt="Customer.io Logo" /> **[Customer.io](https://docs.customer.io/ai/mcp-server/)** - Let any LLM work directly with your Customer.io workspace to create segments, inspect user profiles, search for customers, and access workspace data. Analyze customer attributes, manage audience targeting, and explore your workspace without switching tabs.
 - <img height="12" width="12" src="http://app.itsdart.com/static/img/favicon.png" alt="Dart Logo" /> **[Dart](https://github.com/its-dart/dart-mcp-server)** - Interact with task, doc, and project data in [Dart](https://itsdart.com), an AI-native project management tool
 - <img height="12" width="12" src="https://cdn.bfldr.com/9AYANS2F/at/k8bgnnxhb4bggjk88r4x9snf/databricks-symbol-color.svg?auto=webp&format=png&width=12&height=13" alt="Databricks Logo" /> **[Databricks](https://docs.databricks.com/aws/en/generative-ai/mcp/)** - Connect to data, AI tools & agents, and the rest of the Databricks platform using turnkey managed MCP servers. Or, host your own custom MCP servers within the Databricks security and data governance boundary.
 - <img height="12" width="12" src="https://datahub.com/wp-content/uploads/2025/04/cropped-Artboard-1-32x32.png" alt="DataHub Logo" /> **[DataHub](https://github.com/acryldata/mcp-server-datahub)** - Search your data assets, traverse data lineage, write SQL queries, and more using [DataHub](https://datahub.com/) metadata.