[FEATURE] ng add support

[doggy8088]

Overview of the feature

ng add @compodoc/compodoc

1. Add default tsconfig.doc.json for normal Angular project.

2. Add scripts section for package.json

Motivation for or Use Case

Good for Angular beginner.

Related issues

N/A

[vogloblinsky]

Is these scripts ok for you ?

'compodoc:build': 'compodoc -p tsconfig.doc.json',
'compodoc:build-and-serve': 'compodoc -p tsconfig.doc.json -s',
'compodoc:serve': 'compodoc -s'