Added Support for React Native Projects

[prscX]

Hi

First of all I would like to appreciate for creating such a cool nice, library.

I have created the React Native bridge plugin for using this library with React Native projects

I have added the same in README. Can you please merge this request so that if someone is looking to use this library for React Native projects can easily do the same

Please let me know in case any changes are required

react-native-iconic

Thanks Pranav