Rocaille.java is CREATED and DONE

src/main/java/model/Rocaille.java

+package model;
+
+import util.Position;
+
+public class Rocaille implements TerrainElement {
+    private final Position position;
+
+    public Rocaille(Position position) {
+        this.position = position;
+    }
+
+    @Override
+    public Position getPosition() {
+        return position;
+    }
+
+    @Override
+    public boolean isTraversableByFirefighter() {
+        return true;
+    }
+
+    @Override
+    public int getFirePropagationDelay() {
+        return 4; // 4 tours pour que le feu se propage
+    }
+}