feat/player special ability impl

src/main/java/org/example/Player.java

@@ -24,15 +24,16 @@ public class Player extends Entity {
 
     public void useSpecialAbility(){
         if(this.specialAbility == SpecialAbility.DAMAGE){
-            this.setDamage(MAX_ENDURANCE);
+            this.setDamage(this.getDamage()*2);
         }
 
         if(this.specialAbility == SpecialAbility.FULLHEAL){
-
+            this.setPv(this.getPvMax());
         }
 
         if(this.specialAbility == SpecialAbility.SHIELD ){
-
+            //to-do
+            //add random for variation damage each round
         }
     }