Add expo-passkey library

[iosazee]

📝 Why & how

I'm adding the Expo-passkey library to the React Native Directory. This library provides a complete FIDO2-inspired passkey authentication solution for React Native apps using Expo, allowing developers to implement biometric authentication (Face ID, Touch ID, fingerprint) without passwords.

Key features:

• Cross-platform support for iOS (16+) and Android (10+)
• Complete passkey lifecycle management (registration, authentication, revocation)
• Integration with Better Auth for server and client
• Type-safe API with TypeScript definitions
• Security features like device binding and automatic credential cleanup

The library is stable and production-ready, with comprehensive documentation and example projects available.

✅ Checklist

• Added library to react-native-libraries.json

[Simek]

Hey @iosazee, thanks for adding new entry to the directory! 👍

Left a small set of suggestions below, before we can merge it it.

[Simek]

Thanks for the updates! 👍