MiniApp Standardization White Paper

2019-10-09: Roy recruiting people from Chinese Web Accessibility Community Group to review. Also ACTION-2214 Becky to review.
2020-01-22: Becky did review this back in October but never recorded findings. This spec does discuss a rich UI:"MiniApp platform provides many components to help developers build a fancy UI, including basic components like View, Form, Image, and high-level component like Maps." Thus, any miniApp specification should have an accessibility section. The platform should output accessible content.