[FEATURE] Document iOS Shake Detection Limitations

[MrLepage]

Description

The shake detection feature is currently not enabled for iOS:

if (OperatingSystem.isAndroid || OperatingSystem.isMacOS) {
    _shakeDetector = ShakeDetector.autoStart(
        onPhoneShake: navigateToCallListScreen,
        shakeThresholdGravity: 4,
    );
}

However, this limitation is not documented anywhere in the README or API documentation. Users might expect shake detection to work on iOS since it's not explicitly mentioned as unsupported.

Proposed Documentation Update

Add a note in the README and API documentation about platform support.

Why

Clear documentation about platform support helps users:

1. Understand what features to expect on each platform
2. Plan alternative implementations if needed
3. Avoid spending time debugging "non-working" features

Question

Could you explain why shake detection is not activated on iOS?
Is there a technical limitation or specific reason for this platform exclusion?