Added PreferenceTest and folder.
Added PreferenceTest and folder.


Former-commit-id: 4fc9f996aaa9f3248135adb172a45150d04158e0
vronvali/iLanguage,cesine/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,cesine/iLanguage,iLanguage/iLanguage,cesine/iLanguage,cesine/iLanguage,vronvali/iLanguage,vronvali/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,cesine/iLanguage