User can login/register a new account

[Sanjidah]

• [x] User can sign up and register a new account - link to create a Spotify account

• [x] User can log in to existing Spotify account - authentication page

  • https://developer.spotify.com/documentation/ios/quick-start/
  • let button = SpotifyLoginButton(viewController: self, scopes: [.streaming, .userLibraryRead])
  • self.view.addSubview(button)

• https://steelkiwi.com/blog/how-connect-spotify-sdk-your-project/

• https://medium.com/@brianhans/getting-started-with-the-spotify-ios-sdk-435607216ecc