bring back ng init to initialize a new blank workspace

[ctaepper]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Command (mark with an x)

- [x] init  ;-)
- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

I want to create a new project/workspace with a predefined structure for applications and libraries using the cli.

Repro steps

currently I have to

1. ng new projectname
2. project directory gets created with the default application project
3. I use ng g application another-app and ng g library my-lib to create my apps and libs
4. I delete the default app from file system and remove it from angular.json

Desired functionality

I want to use ng init in order to

1. if no package.json is present in working dir, create the same package.json as ng new does. If package.json is already present, just extend it with angular (dev)dependencies
2. create a blank angular.json inside working dir with no projects define
3. I can now start using ng g application another-app and ng g library my-lib to create my apps and libs
4. (I do not have to delete any default projects from file system and angular.json)

[filipesilva]

Duplicate of #11402

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