adding Zencoder description

Author: davila7

docs/clients.mdx

@@ -895,6 +895,22 @@ Theia AI and Theia IDE's MCP integration provide users with flexibility, making
 - Tight integration with editor features and workspace context
 - Does not support MCP resources
 
+### Zencoder
+
+[Zencoder](https://zecoder.ai) is a coding agent that's available as an extension for VS Code and JetBrains family of IDEs, meeting developers where they already work. It comes with RepoGrokking (deep contextual codebase understanding), agentic pipeline, and the ability to create and share custom agents.
+
+**Key features:**
+
+- RepoGrokking - deep contextual understanding of codebases
+- Agentic pipeline - runs, tests, and executes code before outputting it
+- Zen Agents platform - ability to build and create custom agents and share with the team
+- Integrated MCP tool library with one-click installations
+- Specialized agents for Unit and E2E Testing
+
+**Learn more:**
+
+- [Zencoder Documentation](https://docs.zencoder.ai)
+
 ## Adding MCP support to your application
 
 If you've added MCP support to your application, we encourage you to submit a pull request to add it to this list. MCP integration can provide your users with powerful contextual AI capabilities and make your application part of the growing MCP ecosystem.