fix(py/samples/prompt_demo): add readme with instructions

[yesudeep]

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[gemini-code-assist]

Summary of Changes

Hello @yesudeep, 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 introduces a README.md file within the py/samples/prompt_demo directory. Its primary purpose is to enhance the usability of the prompt demonstration by offering clear, step-by-step guidance on environment setup, execution, and an explanation of the prompt file organization. This addition aims to streamline the onboarding process for users interacting with this specific sample.

Highlights

• New README File: A new README.md has been added to the py/samples/prompt_demo directory, providing essential instructions for setting up the environment, running the sample, and understanding the prompt structure.

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[gemini-code-assist]

Code Review

This pull request adds a README.md file with instructions for running the prompt_demo sample. The README is a good addition, but the setup instructions are incomplete. I've suggested an improvement to make the setup process clearer and more comprehensive for users by including prerequisites and installation steps for all required tools and libraries. This will significantly improve the user experience for anyone trying to run this sample.