add debug video reference

Author: kentcdodds

exercises/FINISHED.mdx

@@ -63,4 +63,10 @@ sampling. You've learned to design for extensibility, safety, and real-world use
 cases—empowering both users and language models to interact with your server in
 powerful, structured ways.
 
+## Next Steps
+
+Now you can build your own MCP server! Learn how to get the development
+environment up here:
+[How to Debug Your MCP Server](https://www.epicai.pro/how-to-debug-your-mcp-server-38qyl)
+
 Amazing work! 🎉