Upload video demonstration for Agent Companion Chat

Added a video demonstration for the Agent Companion Chat.

Author: rstrahan

docs/agent-companion-chat.md

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 The Agent Companion Chat is an interactive AI assistant that provides a conversational experience for the GenAI IDP Accelerator. Unlike the document-specific troubleshooting tool, the companion chat offers persistent, multi-turn conversations with specialized agents that can help with analytics, code assistance, error diagnosis, and general questions about the system.
 
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 ### Key Features
 
 - **Multi-Turn Conversations**: Have natural back-and-forth conversations with context awareness