text: export const LOAD_CONTACTS = 'LOAD_CONTACTS';
  export const ADD_CONTACT = 'ADD_CONTACT';
  export const EDIT_CONTACT = 'EDIT_CONTACT';
  export const DELETE_CONTACT = 'DELETE_CONTACT';
  
  export const MESSAGE_ERROR = 'MESSAGE_ERROR';
  export const MESSAGE_SUCCESS = 'MESSAGE_SUCCESS';
  