FireBehavior : add the methode updateFires

src/main/java/model/FireBehavior.java

 package model;
 
+import util.Position;
+
+import java.util.List;
+import java.util.Map;
+
 public interface FireBehavior {
+    public List<Position> updateFires(int step, Map<Position, List<Position>> neighbors);
 }