Document OS and CPU/GPU install guidance

[kiwoongyoon]

Title: Document OS and CPU/GPU install guidance

Summary

• Add supported environment notes to the README installation section.
• Document the Windows/WSL2 caveat for GPU workloads.
• Point users to the PyTorch installer selector when they want a smaller CPU-only PyTorch build or a CUDA-specific build before installing TabPFN.

Test evidence

• python - <<'PY' ... PY passed and confirmed the README contains the expected OS and CPU/GPU installation guidance.
• Reviewed git diff -- README.md; the patch is documentation-only.

Risks or notes for maintainers

• The OS wording is conservative and says TabPFN is primarily tested on Linux and macOS. Please adjust if native Windows should be documented as fully supported.
• The docs link to the PyTorch selector instead of hard-coding CPU/CUDA install URLs, so users get current commands from PyTorch.

[CLAassistant]

All committers have signed the CLA.

[gemini-code-assist]

Code Review

This pull request updates the README.md to provide clearer installation instructions for TabPFN, including supported Python versions, platform recommendations (such as WSL2 for Windows), and custom PyTorch installation steps. The reviewer suggested adding an example PyTorch installation command to the two-step installation block to make the instructions more actionable.

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[priorphil]

Hey, I'm OOO for 2 weeks with no laptop access, could you reassign to open source stewards to allow for auto-assign? Thanks!

…

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[oscarkey]

thanks for your contribution! just a few of comments/questions.

[oscarkey]

Windows users should prefer WSL2

do you happen to have a page from the pytorch docs we could link to here, to give some context?

[oscarkey]

Suggested change

	# Example: Install PyTorch first (get your specific command from the selector)
	pip install torch --index-url https://download.pytorch.org/whl/cpu

I suggest we only need the first example.

[oscarkey]

primarily tested on Linux and macOS

We run our full CI suite on Windows, so I don't think we need to say this. Is there a particular issue you've been facing on windows?