Update readme.

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Summary: .

Differential Revision: D56517032

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3302

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:x: 1 New Failure

As of commit 46702762ee3e0bbb33169d13f41327185a1e2223 with merge base d3326a2073dee7baf78044fb3afd0772edbc616a ():

NEW FAILURE - The following job has failed:

• Apple / test-demo-ios / macos-job (gh) RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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