blazor-components

Describe the bug

![image](https://user-images.githubusercontent.com/25119211/125054605-fc934600-e0d8-11eb

SignOutSessionStateManager is recommended to ensure sign-outs requests are coming from a user. However, this type depends on IJSRuntime and could be added by default to the Services collection during the AddTestAuthorization() method, where JSInterop can also be configured to correctly handle JSInterop invocations.

E.g.:

context.Services.AddSingleton<SignOutSessionStateManag

Perhaps adding a CodeTour would help make it easier for new contributors to find their way around our project.

Let's look at using the CONTRIBUTING doc to make a snazzy CodeTour for future contributors to learn about our project

Depends on #317

Create the VideoPlaylistController with the following methods

• public async Task CreatePlaylist(PlaylistModel playlistModel, CancellationToken cancellationToken)
• public async Task DeletePlaylist(long playlistId, CancellationToken cancellationToken)
  • If the user is not owner of the playlist, throw an exception with the following message: "Unable to delete. You a