chore : Add README and setup instructions for dice_agent_rest sample

[geekdevtr]

Summary

This PR adds a dedicated README.md for the a2a-samples/samples/python/agents/dice_agent_rest example.
The README documents how to set up the environment, install dependencies with uv, and run the REST dice agent.

Fixes #<410> 🦕

[gemini-code-assist]

Summary of Changes

Hello @geekdevtr, 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 enhances the dice_agent_rest sample by introducing a comprehensive README.md file. This new documentation aims to streamline the onboarding process for users, providing clear, step-by-step instructions for environment setup, dependency management using either uv or pip, and crucial API key configuration, ultimately making the sample more accessible and easier to run.

Highlights

• New README.md: A new README.md file has been added to the a2a-samples/samples/python/agents/dice_agent_rest directory.
• Setup Instructions: The README provides detailed instructions for setting up the development environment, including Python prerequisites and how to retrieve the source code.
• Dependency Management: It outlines two methods for installing dependencies: using uv (with uv.lock) or pip, catering to different user preferences.
• API Key Configuration: Clear instructions are included for setting the GOOGLE_API_KEY on both macOS/Linux and Windows PowerShell environments.
• Environment Verification: A final environment sanity check command is provided to help users verify that their setup is correct and ready to run the agent.

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[gemini-code-assist]

Code Review

This pull request adds a very helpful README.md file with setup instructions for the dice_agent_rest sample. The documentation is well-structured and clear. I've provided a couple of minor suggestions to improve the instructions for users on different operating systems, aiming for better clarity and consistency.