Add angular-material UI choice

[dvaJi]

Ref to #124
I don't know if this new option should be added to ngx-core or extend it. IMO,it's better add it to core.

[sinedied]

Thanks for the submission, I'll take a look at it ❤️

You are right for the option, I'll add it to the core dependency ASAP.

[sinedied]

I just published a new @ngx-rocket/core 3.0.0 version with the material prefix support, could you try it to fix the tests?

[sinedied]

Perfect! Are you ok if I merge this temporarily in a separate branch, so that I can push it a bit further? I would like to make the template responsive using the side menu component, integrate with flex layout and replace font awesome with Material icons.

I have some of these additions WIP here: https://github.com/ngx-rocket/starter-kit/tree/feature/material, it would mostly be a matter of merging it as you did all the template work 👍

[dvaJi]

Sure! also, I've added a customizable scss but maybe could be good adding options to choose available pre-built themes like:

deeppurple-amber.css
indigo-pink.css
pink-bluegrey.css
purple-green.css

[sinedied]

That could be an idea, but since you already added customizable theming I think it's more flexible as you can already choose any color combination 😃