Added TypeScript Typings
Added TypeScript Typings

Not sure if you are interested in supporting Typescript users, but I did this while using your library for myself and thought I would share. Thanks!
react-native-community/react-native-linear-gradient,react-native-community/react-native-linear-gradient,react-native-community/react-native-linear-gradient,react-native-community/react-native-linear-gradient