how to add google maps into angular app

file.ts

  // get showroom list...
  getShowroomList(){
    this._common.showLoader(true);
    this._admin.geShowroomList().subscribe(result=>{
      this._common.showLoader(false);
      this.showrooms = result;
    },error=>{
      this._common.showLoader(false);
      this._alert.error('Something went wrong');
    })
  }