update Player class and Entity interface

Java-Knight/src/main/java/org/project/entity/Entity.java

@@ -1,7 +1,7 @@
 package org.project.entity;
 
 public interface Entity {
-    void attack(Entity target);
+    void attack(Entity target, double multiplier);
 
     void defend();
 
@@ -15,7 +15,7 @@ public interface Entity {
 
     int getMaxMP();
 
-    /*
-    TODO: ADD OTHER REQUIRED AND BONUS METHODS
-    */
+    boolean isDefending();
+
+    void setDefending(boolean defending);
 }