Add Crest to Menu Bar Tools

[zack40x]

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Types of Changes

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• New addition to list
• Fixing bug in existing item in list
• Removing item from list
• Changing structure (organization) of list

Proposed Changes

Describe each of your changes here to communicate to the maintainers why we should accept this pull request.

1. Adds Crest (https://crestnotch.app) to Menu Bar Tools, in alphabetical order, synced across README.md, README-zh.md, README-ja.md, and README-ko.md. Crest turns the MacBook notch into a panel with media controls, calendar, todos, clipboard, system stats, and a built-in Claude co-pilot, which sets it apart from the notch apps already listed. It is a signed and notarized native app for macOS 14+ with a free tier, so no icon markers are added, matching how NotchNook and DynamicHorizon are listed. Disclosure: I am the developer.

PR Checklist

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• I have read the CONTRIBUTING guide
• I have explained why this PR is important
• I have added necessary documentation (if appropriate)

Further Comments

None, it is a single new entry in each of the four READMEs.