initial load

YouTubeViewers.Domain/Commands/ICreateYouTubeViewerCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using YouTubeViewers.Domain.Models;
+
+namespace YouTubeViewers.Domain.Commands
+{
+    public interface ICreateYouTubeViewerCommand
+    {
+        Task Execute(YouTubeViewer youTubeViewer);
+    }
+}

YouTubeViewers.Domain/Commands/IDeleteYouTubeViewerCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace YouTubeViewers.Domain.Commands
+{
+    public interface IDeleteYouTubeViewerCommand
+    {
+        Task Execute(Guid id);
+    }
+}

YouTubeViewers.Domain/Commands/IUpdateYouTubeViewerCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using YouTubeViewers.Domain.Models;
+
+namespace YouTubeViewers.Domain.Commands
+{
+    public interface IUpdateYouTubeViewerCommand
+    {
+        Task Execute(YouTubeViewer youTubeViewer);
+    }
+}

YouTubeViewers.Domain/Models/YouTubeViewer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace YouTubeViewers.Domain.Models
+{
+    public class YouTubeViewer
+    {
+        public YouTubeViewer(Guid id, string username, bool isSubscribed, bool isMember)
+        {
+            Id = id;
+            Username = username;
+            IsSubscribed = isSubscribed;
+            IsMember = isMember;
+        }
+
+        public Guid Id { get; }
+        public string Username { get; }
+        public bool IsSubscribed { get; }
+        public bool IsMember { get; }
+    }
+}

YouTubeViewers.Domain/Queries/IGetAllYouTubeViewersQuery.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using YouTubeViewers.Domain.Models;
+
+namespace YouTubeViewers.Domain.Queries
+{
+    public interface IGetAllYouTubeViewersQuery
+    {
+        Task<IEnumerable<YouTubeViewer>> Execute();
+    }
+}

YouTubeViewers.Domain/YouTubeViewers.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>