Library can be used with the below steps
npm i materialgrammi ng-materialgrammi -s
Edit angular.json, find the styles array and add materialgrammi to your styles
"styles": [ "src/styles.css", "materialgrammi/materialgrammi.min.css"]
Edit your module, import Materitalgrammi's module to your imports
import { MaterialgrammiModule } from 'ng-materialgrammi';
imports: [MaterialgrammiModule]