Change README

Author: sis0k0

README.md

@@ -424,8 +424,8 @@ Test the agent. Here are a few sample prompts:
 - What’s the total cost of my cart?
 ```
 
-## Final
+## 🎉 Congratulations
 
-🎉 Congratulations—you’ve completed the exercises!
+You’ve finished all exercises! Now you have a fully-fledged grocery shopping agent, connected to a vector search database!
 
 Complete the short assessment to claim your **AI Agents with MongoDB Skill Badge** here: [mdb.link/adk-london-badge](https://mdb.link/adk-london-badge).