[FEATURE] Add Windows PowerShell and CMD Setup Examples

[BhakktiGautam]

Problem

The README currently provides environment variable setup examples using Unix/Linux commands such as:

export OPENAI_API_KEY=...
export GROQ_API_KEY=...

These commands do not work directly on Windows systems and may confuse new users.

Proposed Solution

Add Windows-specific examples for:

• PowerShell
• Command Prompt (CMD)

alongside the existing Unix/Linux examples.

Benefits

• Better onboarding experience for Windows users.
• Reduced setup confusion.
• More platform-inclusive documentation.

[BhakktiGautam]

Hi @Vishisht16,

I recently reviewed the project documentation and raised this issue because I believe it would improve the onboarding experience for new users and contributors.

I'd love to work on this enhancement and submit a PR for it. Could you please assign this issue to me if it aligns with the project's goals?

Thank you for maintaining this project and for supporting GSSoC contributors!