Add Windows support

[fentas]

Currently, the project does not support Windows. To expand the user base and improve cross-platform compatibility, implement and test support for Windows. This may involve updating build scripts, resolving OS-specific code issues, and ensuring all features work correctly on Windows environments.

Short checklist for Windows support:

1. binary/download.go:
   • Ensure Windows compatibility for file paths and handle “.exe” suffixes for binaries.
   • Add logic to detect and treat Windows-specific download/install steps.
2. Build Scripts:
   • Update any build scripts (Makefile, shell scripts, etc.) to support Windows environments (e.g., use PowerShell or batch alternatives).
3. Platform Detection:
   • Implement or update OS detection, ensuring Windows is recognized and handled correctly.
4. Filesystem Operations:
   • Use OS-agnostic path handling (filepath package in Go).
   • Handle permissions and executable differences between Unix and Windows.
5. Testing:
   • Test key features on Windows (download, install, run, etc.).
   • Add CI jobs for Windows, if using GitHub Actions or similar.
6. Documentation:
   • Update README and docs to mention Windows support and specific instructions if needed.