support ng add & ng generate using angular-cli 6.0

[vthinkxie]

What problem does this feature solve?

help users to init ng-zorro-antd project and create components more easily.

What does the proposed API look like?

• init project with ng add ng-zorro-antd
• generate demo with ng generate ng-zorro-antd:layout -name=main-layout
• provide quick copy in the demo of the doc site like stackblitz link.

video ref https://www.youtube.com/watch?v=v__RuD9RX3I&t=40s
github ref https://github.com/angular/devkit/tree/master/packages/angular_devkit

[lock]

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