Add project files.

VizhTalk.BuildingBlocks.Application/Configuration/Commnad/ICommandHandler.cs

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+using VizhTalk.BuildingBlocks.Application.Contract;
+using VizhTalk.BuildingBlocks.Domain.Contract;
+
+namespace VizhTalk.BuildingBlocks.Application.Configuration.Commnad;
+
+public interface ICommandHandler<in TCommand>
+    where TCommand : ICommand
+{
+    Task Handle(TCommand request, CancellationToken cancellationToken);
+}
+
+public interface ICommandHandler<in TCommand, TResult>
+    where TCommand : ICommand<TResult>
+{
+    Task<TResult> Handle(TCommand request, CancellationToken cancellationToken);
+}

VizhTalk.BuildingBlocks.Application/Configuration/Notification/INotificationHandler.cs

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+using VizhTalk.BuildingBlocks.Domain.Contract;
+
+namespace VizhTalk.BuildingBlocks.Application.Contract;
+
+public interface INotificationHandler<T>
+    where T : INotification
+{
+    Task Handle(T notification, CancellationToken cancellationToken);
+}

VizhTalk.BuildingBlocks.Application/Configuration/Query/IQueryHandler.cs

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+using VizhTalk.BuildingBlocks.Application.Contract;
+using VizhTalk.BuildingBlocks.Domain.Contract;
+
+namespace VizhTalk.BuildingBlocks.Application.Configuration.Query;
+
+public interface IQueryHandler<in TQuery, TResult> 
+    where TQuery : IQuery<TResult>
+{
+}

VizhTalk.BuildingBlocks.Application/Contract/IExecutionContextAccessor.cs

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+
+namespace VizhTalk.BuildingBlocks.Application.Contract;
+
+public interface IExecutionContextAccessor
+{
+    Guid UserId { get; }
+
+    Guid CorrelationId { get; }
+
+    bool IsAvailable { get; }
+}

VizhTalk.BuildingBlocks.Application/Events/DomainNotificationBase.cs

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+using VizhTalk.BuildingBlocks.Domain;
+
+namespace VizhTalk.BuildingBlocks.Application.Events;
+
+public class DomainNotificationBase<T> : IDomainEventNotification<T>
+    where T : IDomainEvent
+{
+    public T DomainEvent { get; }
+
+    public Guid Id { get; }
+
+    public DomainNotificationBase(T domainEvent, Guid id)
+    {
+        this.Id = id;
+        this.DomainEvent = domainEvent;
+    }
+}

VizhTalk.BuildingBlocks.Application/Events/IDomainEventNotification.cs

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+using VizhTalk.BuildingBlocks.Application.Contract;
+using VizhTalk.BuildingBlocks.Domain.Contract;
+
+namespace VizhTalk.BuildingBlocks.Application.Events;
+
+public interface IDomainEventNotification<out TEventType> : IDomainEventNotification
+{
+    TEventType DomainEvent { get; }
+}
+
+public interface IDomainEventNotification : INotification
+{
+    Guid Id { get; }
+}

VizhTalk.BuildingBlocks.Application/Outbox/IOutbox.cs

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+namespace VizhTalk.BuildingBlocks.Application.Outbox;
+
+public interface IOutbox
+{
+    void Add(OutboxMessage message);
+
+    Task Save();
+}

VizhTalk.BuildingBlocks.Application/Outbox/OutboxMessage.cs

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+namespace VizhTalk.BuildingBlocks.Application.Outbox;
+
+public class OutboxMessage
+{
+    public Guid Id { get; set; }
+
+    public DateTime OccurredOn { get; set; }
+
+    public string Type { get; set; }
+
+    public string Data { get; set; }
+
+    public DateTime? ProcessedDate { get; set; }
+
+    public OutboxMessage(Guid id, DateTime occurredOn, string type, string data)
+    {
+        this.Id = id;
+        this.OccurredOn = occurredOn;
+        this.Type = type;
+        this.Data = data;
+    }
+
+    private OutboxMessage()
+    {
+    }
+}

VizhTalk.BuildingBlocks.Application/VizhTalk.BuildingBlocks.Application.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\VizhTalk.BuildingBlocks.Domain\VizhTalk.BuildingBlocks.Domain.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Data\" />
+  </ItemGroup>
+
+</Project>