Add repository info to package.json

[mrousavy]

Summary

This adds the repository property to the package.json.

One problem with having no repository property is, that tools like license crawlers cannot read the creator and add repository links.

See how the author is ??? and the View Repository button is not present?

Compatibility

OS	Implemented
iOS	✅
Android	✅

Checklist

• [ ] I have tested this on a device and a simulator
• [ ] I added the documentation in README.md
• [ ] I mentioned this change in CHANGELOG.md
• [ ] I updated the typed files (TS and Flow)
• [ ] I added a sample use of the API in the example project (example/App.js)

[mrousavy]

@Esemesek I assume we don't want to change the package name, right?

[Esemesek]

Yup, the package name stays the same for now.