1 - starting by defning the jframe variables.
2 - in the contructor, defining the attributes for deck panel, cardmanager CardLayout.
3 - then, we would like to define each cards in the cardlayout, as c1, c2, c3.
4 - for each panel, we define the J-components, then we return a value for each.
5 - the end is the action-performed section, that we can determine what would happen when we press one of these card deck's buttons.