ng add @angular/material asks to choose theme, but there is no way to preview it

[filipesilva]

Bug, feature request, or proposal:

When using ng add @angular/material, a user will be prompted to choose a theme:

It is hard to make an informed decision about which theme to choose because neither https://material.angular.io/guide/getting-started#step-4-include-a-theme nor https://material.angular.io/guide/theming offer a preview of these themes.

The material docs seem to have a theme picker themselves, but offer no indication of the theme name or whether those four are the same as the choose offered in the prompt:

What is the expected behavior?

There should be a way to preview what the themes that a user is selecting.

What is the current behavior?

A user is asked to choose the theme they have no way of differentiating.

What are the steps to reproduce?

ng new my-material-app
cd my-material-app
ng add @angular/material

What is the use-case or motivation for changing an existing behavior?

Providing a user the necessary background in order to make a decision requested by the prompts.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 7 (Angular/Material/CLI)

Is there anything else we should know?

[filipesilva]

It would also be helpful to mention which themes are light and which are dark, as that affects how examples will look like when using the docs.

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