add scss to angular project code example

Example 1: convert angular project from css to scss

ng config schematics.@schematics/angular:component.styleext scss

Example 2: how to import scss file in angular

In the new angular v6, importing sass files is a little different from the previous version.

I just needed to import like this (in a component stylesheet)

@import "~src/sass/variables";    // note: without file extension

Now everything works fine

Thanks all for the help