add weapon util interface

Java-Knight/src/main/java/org/project/Interface/IDamageUtil.java

@@ -0,0 +1,5 @@
+package org.project.Interface;
+
+public interface IDamageUtil {
+    public int GetDamage();
+}

Java-Knight/src/main/java/org/project/item/Accessory/Weapon.java

@@ -1,8 +1,9 @@
 package org.project.item.Accessory;
 
+import org.project.Interface.IDamageUtil;
 import org.project.entity.Entity;
 
-public class Weapon extends Accessory {
+public class Weapon extends Accessory implements IDamageUtil {
     private final int Damage;
 
     public Weapon (String name, Entity owner, int price, int health, int maxHealth, int damage) {
@@ -10,6 +11,7 @@ public class Weapon extends Accessory {
         this.Damage = damage;
     }
 
+    @Override
     public int GetDamage() {
         return Damage;
     }