Add PowerShell installer and Windows setup instructions to README

[cosmind-rusu]

What’s changed

1. New install.ps1 script

   • Powershell installer to build kubectl-ai.exe on Windows (GOOS=windows, GOARCH=amd64).
   • Fully documented with English .SYNOPSIS/.DESCRIPTION/.PARAMETER/.EXAMPLE and console messages.

2. README.md updates

   • Added Installation on Windows (PowerShell) section with download, build and install steps.
   • Added Environment Variable Configuration (PowerShell) section using setx … -m for persistent & global keys.
   • Translated all Windows/PowerShell snippets and headings into English.
   • Adjusted existing macOS/Linux install sections and cleaned up formatting.
   • Added “Start Contributing” footer link to contributing.md.

Why

• Simplify Windows setup by providing a native PS script.
• Offer clear, global environment variable instructions for all LLM providers.
• Ensure documentation is cohesive and fully in English for cross-platform users.

How to test

1. On Windows, run:

   .\install.ps1 -OutputPath .\kubectl-ai.exe

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[cosmind-rusu]

Hi maintainers 👋,

I’ve put together this PR to streamline the Windows experience:

1. install.ps1 – native PowerShell installer that builds kubectl‑ai.exe on GOOS=windows, GOARCH=amd64, with in‑script help (.SYNOPSIS / .DESCRIPTION / .PARAMETER / .EXAMPLE).
2. README – new Installation on Windows (PowerShell) and Environment Variable Configuration sections, plus fully English headings, minor formatting clean‑ups, and a “Start Contributing” footer link.

Why it matters

• Simplifies setup for Windows users.
• Provides clear, cross‑platform environment‑variable guidance.
• Keeps the documentation cohesive and 100 % in English.

I’d love your review and any suggestions you might have.
If there’s anything I should tweak, just let me know and I’ll update the PR promptly.

Thanks in advance!

[Nicki030]

To test the script, open PowerShell, run .\install.ps1 -OutputPath .\kubectl-ai.exe, and make sure the kubectl-ai.exe file is created with no errors shown.

[cosmind-rusu]

Thanks, @Nicki030!
I’ve just followed those steps locally—kubectl‑ai.exe was generated without any errors.
Let me know if there’s anything else you’d like me to verify. 🙂

[droot]

@cosmind-rusu thank yo for the PR and @Nicki030 thanks for verifying it.

I am planning to refactor the README because it is looking super busy right now. I will hold the PR for now. Most likely, we might want to have dedicated MD for installing on windows.