docs: Update the demo readme.md file

[abiramit5]

Description

Update the readme file to include steps for multiagent collaboration and restructure the doc.

[gemini-code-assist]

Summary of Changes

Hello @abiramit5, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly updates the demo/README.md file to provide a more comprehensive and structured understanding of the demo web application. The changes aim to clarify the underlying agent architecture, detail the process of integrating agents with the A2A protocol, and improve the presentation of the demo's features. This enhancement will make it easier for new users to grasp the system's design and quickly get started with running the examples.

Highlights

• Enhanced Architecture Explanation: The demo/README.md now includes a detailed "Agent Architecture" section, breaking down the components (Frontend, Host Agent, Remote Agent) and their roles in the A2A protocol.
• A2A Agent Conversion Guide: A new sub-section "Converting an Agent to A2A" has been added, providing a step-by-step guide with Python code examples for defining Agent Skill, Agent Card, and Agent Executor.
• Improved Features Presentation: The "Features" section has been refactored into a clear markdown table, enhancing readability and making it easier to grasp the demo's capabilities.
• Updated Example Running Instructions: The "Running the Examples" section has been renamed to "Run the Examples" and updated to highlight the availability of pre-built sample agents for user convenience.

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[gemini-code-assist]

Code Review

This pull request provides a significant and valuable update to the demo's README file. The documentation is now much more detailed, well-structured, and user-friendly, with new sections on agent architecture and a step-by-step guide for A2A conversion. The inclusion of code examples and a features table greatly enhances clarity. I've included a few minor suggestions to further refine the document's wording, structure, and long-term maintainability.