Add the bighouse assets for WFC

pubspec.yaml

@@ -61,6 +61,7 @@ flutter:
   # To add assets to your application, add an assets section, like this:
   assets:
     - assets/images/fonts/
+    - assets/images/wfc/
   #   - images/a_dot_burr.jpeg
   #   - images/a_dot_ham.jpeg