Add mobile app demo section to README

[mergennachin]

No description provided.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18122

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 32 Pending, 2 Unrelated Failures

As of commit fc04d2f with merge base 28783db ():

NEW FAILURES - The following jobs have failed:

• Build Presets / windows (pybind) / build (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Build Presets / windows (windows) / build (gh)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest / windows / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following job failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1

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[github-actions]

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[Copilot]

Pull request overview

Adds a short “Mobile App” section to the Parakeet example README to point readers to an Android demo app and a demo video, helping users discover an end-to-end on-device experience outside this repo.

Changes:

• Add a “Mobile App” subsection to the Parakeet README.
• Link to the out-of-tree Android demo app in meta-pytorch/executorch-examples.
• Add a GitHub-hosted demo video URL.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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[manuelcandales]

@pytorchbot cherry-pick --onto release/1.2 -c docs

[pytorchbot]

Cherry picking #18122

The cherry pick PR is at #18324 The following tracker issues are updated:

• [v1.2.0] Release Schedule and Tracker #17016 (comment)

Details for Dev Infra team

Raised by workflow job