English [en-US] translation

Hello @kdchang and community,

I am currently working on providing an en-US translation for this book. 

I am posting this issue to avoid others coming along and doing overlap work. I will be submitting a PR when it is complete.

Thanks!


作者和開發社群您好，

我正在為這本書寫美式英文的翻譯。

我開這筆issue希望避免社群成員重疊功夫，當完成時會發送PR。

謝謝!