cache/yb_preference library

1. yb_flutter_lib_core package
2. documentation
3. cache/yb_preference.dart

yb_flutter_lib_core package

1. Libraries
2. cache/yb_preference
3. network/http_manager_client
4. utils/cache_util
5. utils/fast_click_util
6. utils/file_util
7. utils/number_util
8. utils/permission_util
9. utils/phone_util
10. utils/print_util
11. utils/reg_exp_util
12. utils/time_util
13. yb_flutter_lib_core