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Add a readme file with build instructions. (#586)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/586

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Reviewed By: cccclai

Differential Revision: D49866403

fbshipit-source-id: 1012457a3c819854144c8cf0c2aaa78edad217cc
A
Anthony Shoumikhin committed
504b9b32406e075f85f1536b0c6afe76c6043c3f
Parent: 3a69ea0
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 10/4/2023, 1:41:19 AM