add banner (#101)

Signed-off-by: Antonio Martinez <anmartinez@nvidia.com>

Author: antoniomtz

README.md

@@ -6,15 +6,15 @@
 
 <div align="center">
 
-![NVIDIA Logo](https://avatars.githubusercontent.com/u/178940881?s=200&v=4)
+![Banner](docs/banner.jpg)
 
 </div>
 
 A reference implementation of the Agentic Commerce Protocol (ACP) and Universal Commerce Protocol (UCP), built for merchant-controlled checkout, payments, and agent orchestration.
 
 ## Architecture
 
-![Shopping Assistant Diagram](docs/agentic-commerce-diagram.jpeg)
+![Agentic Commerce Diagram](docs/agentic-commerce-diagram.jpeg)
 
 ## What You Get