Add AI development setup instructions for chatbot and debugging modules

[Poojamallavarapu]

Summary

This PR adds documentation for setting up the AI development
environment used by chatbot and AI debugging branches in eSim.

Motivation

While setting up the development environment locally, additional
dependencies such as Ollama, the Qwen language model, and the
zstd system package were required but were not documented in the
current INSTALL file.

Changes

• Added a new section "AI Development Setup (Chatbot and AI Debugging Tools)"
• Documented steps for:
  • Creating a Python virtual environment
  • Installing Python dependencies
  • Installing the zstd system package
  • Installing Ollama
  • Downloading the Qwen model
  • Verifying the AI setup

Impact

This documentation helps contributors working on AI-related branches
such as chatbot or AI debugging tools to set up their development
environment more easily.