Add project files.

Core.Blueprint.Service.Domain/Core.Blueprint.Service.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Core.Blueprint.Service.Domain/Dtos/SampleImageUrlDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core.Blueprint.Service.Domain.Dtos
+{
+    public class SampleImageUrlDto
+    {
+        public string Url { get; set; }
+    }
+}

Core.Blueprint.Service.Domain/Entities/BlobSampleImageEntity.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core.Blueprint.Service.Domain.Entities
+{
+    public class BlobSampleImageEntity
+    {
+        public Guid? Id { get; set; }
+        public byte[] FileContent { get; set; } = [];
+    }
+}

Core.Blueprint.Service.Domain/Entities/SecretEntity.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core.Blueprint.Service.Domain.Entities
+{
+    public class SecretEntity
+    {
+        public string? Value { get; set; }
+    }
+}

Core.Blueprint.Service.Domain/Entities/SqlSampleItemEntity.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core.Blueprint.Service.Domain.Entities
+{
+    public class SqlSampleItemEntity
+    {
+        public string? Id { get; set; }
+        public string TestName { get; set; } = string.Empty;
+        public char StatusCode { get; set; } = 'P';
+        public int NumValue { get; set; } = 0;
+        public DateTime CreatedAt { get; set; } = DateTime.Now;
+    }
+}