Create a way to customize ng-new

### Command

new

### Description

for workshops it would be helpful to have a customized start screen with custom html to make it easier for people to start the workshop and have less friction with updated start view with newer versions as e.g. with v17 happened

### Describe the solution you'd like

a configuration which provides a reference to a custom template of a start screen, e.g.

ng new todo-list --start=@ng-girls/starter

and for this there need to be a special scheme to configure the start template or other options

### Describe alternatives you've considered

stackblitz, but I would also have it with the CLI

Comece pelo ponto de entrada do comando ng new e determine como as opções do comando e a configuração do projeto são definidas. O exemplo da issue é ng new todo-list --start=@ng-girls/starter; a implementação deve incluir um esquema definido para selecionar um template inicial personalizado e esclarecer as opções de configuração compatíveis.

Escrita pelo modelo de indexação a partir do texto da issue.