add fields to package.json
add fields to package.json

- Adding a repository field means that people finding the project on npm are able to find the github source code
- adding other fields that usually are good to have

luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggit/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config