docs: add VS Code Marketplace install badge to README header

Author: trentmcnitt

README.md

@@ -9,6 +9,7 @@
 </p>
 
 <p align="center">
+  <a href="https://marketplace.visualstudio.com/items?itemName=trentmcnitt.bespoke-ai"><img src="https://img.shields.io/badge/VS%20Code%20Marketplace-Install-blue?logo=visualstudiocode" alt="Install from VS Code Marketplace"></a>
   <a href="https://marketplace.visualstudio.com/items?itemName=trentmcnitt.bespoke-ai"><img src="https://img.shields.io/visual-studio-marketplace/v/trentmcnitt.bespoke-ai" alt="VS Code Marketplace"></a>
   <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-blue.svg" alt="License: MIT"></a>
 </p>