Add Cursor recommendation to quickstart introduction

Co-authored-by: dan <[email protected]>

Author: cursoragent

fern/quickstart/introduction.mdx

@@ -8,6 +8,10 @@ slug: quickstart/introduction
 
 Vapi is the developer platform for building voice AI agents. We handle the complex infrastructure so you can focus on creating great voice experiences.
 
+<Tip>
+Use the Cursor code editor for the best experience with AI‑assisted development. [Download Cursor](https://cursor.com).
+</Tip>
+
 **Voice agents** allow you to:
 - Have natural conversations with users
 - Make and receive phone calls