welcome function
Implementation
bool welcome() {
String content = '''
+---------------------------------------------------+
| Welcome to the Clean Architeture! |
+---------------------------------------------------+
| Do you want to continue? [y/n] |
+---------------------------------------------------+\n''';
stderr.write(content);
final answer = stdin.readLineSync();
final validator =
answer?.toLowerCase() == 'y' || answer?.toLowerCase() == 'yes';
return answer != null && validator;
}