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Update README.md and add submodule update (#3029)

Summary:
Without the submodule update, install_requitements would not work. Add this step in the documentation's README.md

Pull Request resolved: https://github.com/pytorch/executorch/pull/3029

Reviewed By: lucylq

Differential Revision: D56087389

Pulled By: iseeyuan

fbshipit-source-id: fd96530b44f81b6dfcea07faccef06f6348fa373
M
Mengtao Yuan committed
cd32712b1d60553b6412012567cde7d9f4e9da36
Parent: 21fdc4e
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 4/13/2024, 12:22:15 AM