docs: clarify Yarn 4 setup and contributor onboarding

[Priyans00]

Proposed changes (including videos or screenshots)

Clarifies that the repository uses Yarn 4 (Berry), recommends Corepack for Yarn
management, adds a short Windows note about long path support, and documents that
peer dependency warnings during install are expected.

This is a documentation-only change intended to improve contributor onboarding.

Issue(s)

Closes #1812

Further comments

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Latest commit: 3a64e2b

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[tassoevan]

The README file is autogenerated. You need to change the generation script to allow a fixed section of text like this.

[Priyans00]

Thanks for the clarification
I’ll update the generation script to include a fixed Contributing section with the Yarn 4 Corepack guidance, and regenerate the readme accordingly