Site: https://reactnavigation.org/docs/getting-started
$ yarn add @react-navigation/native
$ expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view
Site: https://reactnavigation.org/docs/hello-react-navigation
$ yarn add @react-navigation/stack
$ yarn add expo-constants
Site: https://docs.expo.io/versions/v36.0.0/sdk/mail-composer/
$ yarn add expo-mail-composer
$ yarn add axios
$ yarn add intl