Added codereview.settings
Added codereview.settings

Review URL: https://codereview.chromium.org/867593002

jakemac53/reflectable,google/reflectable.dart,bwu-dart-contributing/reflectable,jakemac53/reflectable,luisvt/reflectable,bwu-dart-contributing/reflectable,luisvt/reflectable,google/reflectable.dart