Add subdomains

PSManagement.Domain/PSManagement.Domain.csproj

-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net5.0</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Folder Include="Customers\DomainErrors\" />
+    <Folder Include="Identity\Entities\" />
+    <Folder Include="Identity\ValueObjects\" />
+    <Folder Include="Projects\DomainErrors\" />
+    <Folder Include="Projects\Entities\" />
+    <Folder Include="Projects\ValueObjects\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PSManagement.SharedKernel\PSManagement.SharedKernel.csproj" />
+  </ItemGroup>
+
 </Project>