add expo-onboarding

[FTCHD]

📝 Why & how

Adding the expo-onboarding package.

✅ Checklist

• Added library to react-native-libraries.json
• Updated library in react-native-libraries.json

• Documented in this PR how to use the feature or replicate the bug.
• Documented in this PR how you fixed an issue or created the feature.

[Simek]

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

When it comes to out-of-tree platforms, we require an examples using the specific platform package, which I was not able to find in you repository:

• https://github.com/react-native-community/directory?tab=readme-ov-file#%EF%B8%8F-out-of-tree-platforms

If you don't want to work on them, we can remove the flags for now, and update them late in time to do not block the addition.

[FTCHD]

sure, which flags should be removed, or maybe it's easier to say which ones should be kept?

[Simek]

Thanks for the update! 🚀