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Update top-level README.md to recommend using a release tag (#912)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/912

Without this, users might try using the `main` branch, which we can't guarantee quality for.

Reviewed By: mergennachin

Differential Revision: D50288620

fbshipit-source-id: a4414f95e14b14e5fb4a97c07d09981497e194f5
D
Dave Bort committed
43093e2caf889a9046785671c328ef9e98e137d1
Parent: 286aacc
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 10/14/2023, 11:14:37 PM