создал проекты

CaseAccounting/CaseAccountingContracts/BindingModels/CaseBindingModel.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CaseAccountingContracts.BindingModels
+{
+	public class CaseBindingModel
+	{
+	}
+}

CaseAccounting/CaseAccountingDataBaseImplement/CaseAccountingDataBaseImplement.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
@@ -6,4 +6,9 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Folder Include="Implements\" />
+    <Folder Include="Models\" />
+  </ItemGroup>
+
 </Project>