title: No provider for BsModalService, what I need to change?
body: <p><strong>usermodule.ts</strong></p>
  <p>Imports:</p>
  <pre><code>import { NgModule } from '@angular/core';
  import { CommonModule } from '@angular/common';
  import { BrowserModule } from '@angular/platform-browser';
  import { UsersRoutingModule } from './users-routing.module';
  import { UserListComponent } from './user-list/user-list.component';
  import { ModalModule } from 'ngx-bootstrap/modal';
  
  
  @NgModule({
   declarations: [UserListComponent],
  </code></pre>
  <p><em><strong>Should I add some in imports?</strong></em></p>
  <pre><code>   imports: [
      CommonModule,
      BrowserModule,
      UsersRoutingModule,
      ModalModule.forRoot()
     ],
  </code></pre>
  <p><strong>Should I add some in providers?</strong></p>
  <pre><code>  providers: 
   })
    export class UsersModule { }
  </code></pre>