[Work #4] Flutter Study Group #1 - 新手班 Write your first Flutter app

In this training, we are working on Your first Flutter APP (https://codelabs.developers.google.com/codelabs/flutter-codelab-first). I found it has a big different when compairing with the older versions. It consists how to use state with Provider package and how to code the basic adaptive layout. 

 在此培訓中，我們致力於Your first Flutter APP (https://codelabs. developers.google.com/codelabs/flutter-codelab-first)。 我發現它與舊版本相比有很大的不同。它包括如何將state 與 Provider 一起使用以及如何編寫基本自適應佈局的代碼。