move anthropic video to unit 3

Author: burtenshaw

units/en/unit3/introduction.mdx

@@ -2,6 +2,12 @@
 
 Welcome to Unit 3! In this unit, we'll build a practical MCP server that enhances Claude Code with custom development workflows while learning all three MCP primitives.
 
+If you'd like to hear from the creators of MCP, here's a video they made:
+
+<Youtube id="CQywdSdi5iA" />
+
+In this video Theo Chu, David Soria Parra and Alex Albert dive into the Model Context Protocol (MCP), the standard that's changing how AI applications connect with external data and tools.
+
 ## What You'll Build
 
 **PR Agent Workflow Server** - An MCP server that demonstrates how to make Claude Code team-aware and workflow-intelligent:
@@ -76,4 +82,5 @@ Once installed, you'll use Claude Code throughout this unit to test your MCP ser
 
 </Tip>
 
-By the end of this unit, you'll have built a complete MCP server that demonstrates how to transform Claude Code into a powerful team development assistant, with hands-on experience using all three MCP primitives.
+By the end of this unit, you'll have built a complete MCP server that demonstrates how to transform Claude Code into a powerful team development assistant, with hands-on experience using all three MCP primitives.
+