title: Adding a local database to angular 10
body: <p>I am making a simple login app. Til now, I have made an app and made just 2 users (1 normal user ad 1 admin user), but it's basically hardcode. It looks like this now (in my authentication service):</p>
  <pre><code>private readonly mockedUser = new SignInData('user1', '123');
  private readonly mockedAdmin = new SignInData('admin1', '456');
  </code></pre>
  <p>I tied the above to another file, my SignInData, which looks like this:</p>
  <pre><code>import { StringifyOptions } from 'querystring';
  
  export class SignInData {
      private userID: string;
      private password: string;
  
      constructor(userID: string, password: string){
          this.userID = userID;
          this.password = password;
      }
  
      getUserID(): string
      {
          return this.userID;
      }
  
      getPassword(): string
      {
          return this.password;
      }
  }
  </code></pre>
  <p>Now I wanna upgrade this to a local database, so new users (either normal users or admins) can be added and so everyone can login with their own username and password. How do I setup a local database?</p>