create project and customercontroller

AB.Domain/AB.Domain.csproj

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

AB.Domain/Entities/Customer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Entities
+{
+    public class Customer
+    {
+        Guid coutomerId;
+
+    }
+}

AB.Domain/Entities/Product.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Entities
+{
+    public class Product
+    {
+        Guid productId;
+
+    }
+}

AB.Domain/Entities/Supplier.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Entities
+{
+    public class Supplier
+    {
+
+        Guid supplierId;
+    }
+}

AB.Domain/Exceptions/BusinessPartnerNotFoundException.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Exceptions
+{
+    public class BusinessPartnerNotFoundException : NotFoundException
+    {
+
+        public BusinessPartnerNotFoundException(Guid businessPartnerId)
+        : base ($"The BusinessPartner with the indetifier {businessPartnerId} was not found.")
+            { }
+
+    }
+}

AB.Domain/Exceptions/NotFoundException.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Exceptions
+{
+
+	[Serializable]
+	public abstract class NotFoundException : Exception
+	{
+		public NotFoundException() { }
+		public NotFoundException(string message) : base(message) { }
+		public NotFoundException(string message, Exception inner) : base(message, inner) { }
+		protected NotFoundException(
+		  System.Runtime.Serialization.SerializationInfo info,
+		  System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
+	}
+}

AB.Domain/Repositories/ICustomerRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Repositories
+{
+    public class ICustomerRepository
+    {
+    }
+}

AB.Domain/Repositories/ISupplierRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Repositories
+{
+    public class ISupplierRepository
+    {
+    }
+}

AB.Domain/Repositories/IUnitOfWork.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.Domain.Repositories
+{
+    public class IUnitOfWork
+    {
+    }
+}