Update instructions for getting started (#781)
Update instructions for getting started (#781)

- Users need to run expo install now.
- Can initialize a bare React Native project with RNGH using expo-cli
kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler