Country.fromMap constructor
It creates a Country object from a map.
Args: map (Map<String, dynamic>): The map that contains the data to be converted to a Country object.
Returns: A Country object
Implementation
factory Country.fromMap(Map<String, dynamic> map) {
return Country(
name: map['name'] != null ? map['name'] as String : null,
dialCode: map['dial_code'] != null ? map['dial_code'] as String : null,
code: map['code'] != null ? map['code'] as String : null,
);
}