Add CONTRIBUTING.md
Add CONTRIBUTING.md

eiriklv/react-native-web,necolas/react-native-web,AnSavvides/react-native-web,chandu0101/react-native-web,AnSavvides/react-native-web,chandu0101/react-native-web,necolas/react-native-web,eiriklv/react-native-web,trojanspike/react-native-web,necolas/react-native-web,trojanspike/react-native-web