Enhance README with additional images

Added images to the README for better visualization.

Author: brown9804

7_iot/iot-hub/README.md

@@ -11,6 +11,13 @@ Last updated: 2026-02-17
 
 > This template creates an Azure IoT Hub.
 
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+<img width="1362" height="686" alt="image" src="https://github.com/user-attachments/assets/37facbbd-9e4f-417e-9a84-d123ad738e7a" />
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+<img width="1249" height="610" alt="image" src="https://github.com/user-attachments/assets/32b7dcaf-90e0-4c41-a914-9710c42c8bc1" />
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+<img width="1492" height="927" alt="image" src="https://github.com/user-attachments/assets/80a04f13-ae75-4567-a4f3-0afa8da2a550" />
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 ## Usage
 
 ```sh