ajout du dp Command

design_pattern/src/modele/DPCommand/Command.java

..._pattern/src/modele/DPCommand/CommandCreerGuerisseur.java

...gn_pattern/src/modele/DPCommand/CommandCreerGuerrier.java

design_pattern/src/modele/DPCommand/CommandCreerRoi.java

design_pattern/src/modele/DPCommand/CommandCreerSorcier.java

design_pattern/src/modele/DPCommand/Invoker.java

design_pattern/src/modele/DPCommand/Receiver.java

design_pattern/src/modele/DPVisiteur/DegatVisiteur.java

design_pattern/src/modele/DialogueTerminal.java

design_pattern/src/tests/DegatVisiteurTest.java