chore: add android setup link to readme
chore: add android setup link to readme

This closes #37

lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login,lwhiteley/react-native-facebook-login,lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login,leonacky/react-native-facebook-login