Update discover.md with autogen-ext-mcp community package (#4826)

Co-authored-by: Jack Gerrits <[email protected]>

python/packages/autogen-core/docs/src/user-guide/extensions-user-guide/discover.md

@@ -38,6 +38,7 @@ Find community samples and examples of how to use AutoGen
 |---|---|---|
 | [autogen-watsonx-client](https://github.com/tsinggggg/autogen-watsonx-client)  | [PyPi](https://pypi.org/project/autogen-watsonx-client/) | Model client for [IBM watsonx.ai](https://www.ibm.com/products/watsonx-ai) |
 | [autogen-openaiext-client](https://github.com/vballoli/autogen-openaiext-client)  | [PyPi](https://pypi.org/project/autogen-openaiext-client/) | Model client for other LLMs like Gemini, etc. through the OpenAI API |
+| [autogen-ext-mcp](https://github.com/richard-gyiko/autogen-ext-mcp) | [PyPi](https://pypi.org/project/autogen-ext-mcp/) | Tool adapter for Model Context Protocol server tools |
 
 <!-- Example -->
 <!-- | [My Model Client](https://github.com/example)  | [PyPi](https://pypi.org/project/example) | Model client for my custom model service | -->