CLI command to generate new views

This is an existing, but for some reason cancelled issue over here
https://github.com/NativeScript/nativescript-cli/issues/905

I groan every time I need to add a new view... it would be endlessly helpful to
"tns view add mypage" and have it generate the basic subs for a page, like the xml with the already in there, the ts\js (with navto wired, maybe a model) , css... all stubbed in

• tns view add mypage
• tns view add mypage --ts
• tns view add mypage --model myModel

Or whatever...

先檢視連結的已取消 issue #905，以及提議的 tns view add 命令形式。在尋找 CLI 進入點之前，先定義命令支援的選項。完成應代表產生所要求的 XML、TypeScript 或 JavaScript，以及 CSS stub，並可選擇接上 model 和 navigation。