external_app_launcher 3.1.0
https://stackoverflow.com/questions/55771211/can-any-one-tell-me-how-to-open-another-app-using-flutter
onPressed: () {
LaunchApp.openApp(
androidPackageName: ‘PackageName’,
iosUrlScheme: ‘pulsesecure://’,
appStoreLink: ‘itms-apps://itunes.apple.com/us/app/pulse-secure/id945832041’,
);