Add demo link to IDP CLI documentation

Added demo link for IDP CLI documentation.

Author: rstrahan

docs/idp-cli.md

@@ -12,6 +12,12 @@ A command-line tool for batch document processing with the GenAI IDP Accelerator
 📈 **Batch Analytics** - Success rates, durations, and detailed error reporting  
 🎯 **Evaluation Framework** - Validate accuracy against baselines with detailed metrics
 
+Demo:
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+https://github.com/user-attachments/assets/3d448a74-ba5b-4a4a-96ad-ec03ac0b4d7d
+
+
+
 ## Table of Contents
 
 - [Installation](#installation)