FirefighterManager : add the methode getFirefighterPositions

src/main/java/model/FirefighterManager.java

 package model;
 
-public class FirefighterManager {
+import util.Position;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+public class FirefighterManager implements FirefighterBehavior, FirefighterProperties {
+    private List<Position> firefighterPositions;
+
+    public FirefighterManager(List<Position> firefighterPositions) {
+        this.firefighterPositions = firefighterPositions;
+    }
+
+    @Override
+    public Position moveToTarget(Position currentPosition, Collection<Position> firePositions, Map<Position, List<Position>> neighbors) {
+        return null;
+    }
+
+    @Override
+    public void extinguishFire(Position firePosition) {
+
+    }
+
+    @Override
+    public List<Position> getFirefighterPositions() {
+        return firefighterPositions;
+    }
+
+    @Override
+    public void setFirefighterPosition(Position oldPosition, Position newPosition) {
+
+    }
 }