Добавьте файлы проекта.

Demo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35312.102
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo", "Demo\Demo.csproj", "{983820F6-FF31-4B3A-8593-831BC3904E80}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{983820F6-FF31-4B3A-8593-831BC3904E80}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{983820F6-FF31-4B3A-8593-831BC3904E80}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{983820F6-FF31-4B3A-8593-831BC3904E80}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{983820F6-FF31-4B3A-8593-831BC3904E80}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4F43A963-447C-4FCB-BB78-8D315EC0F1D6}
+	EndGlobalSection
+EndGlobal

Demo/Data/LocalData/Entity/Group.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.domain.Models
+{
+    public class GroupLocalEntity
+    {
+        public required int Id { get; set; }
+        public required string Name { get; set; }
+
+    }
+}

Demo/Data/LocalData/Entity/Presence.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.domain.Models
+{
+    internal class PresenceLocalEntity
+    {
+        public required Guid UserGuid { get; set; }
+        public bool IsAttedance { get; set; } = true;
+        public required DateOnly Date { get; set; }
+
+        public required int LessonNumber { get; set; }
+    }
+}

Demo/Data/LocalData/Entity/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.domain.Models
+{
+    public class UserLocalEnity
+    {
+        public required string FIO { get; set; }
+        public Guid Guid { get; set; }
+
+        public required int GroupID { get; set; }
+    }
+}

Demo/Data/LocalData/LocalStaticData.cs

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+using Demo.domain.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.NetworkInformation;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.Data.LocalData
+{
+    public static class LocalStaticData
+    {
+        public static IEnumerable<GroupLocalEntity> groups => new List<GroupLocalEntity>
+        
+        {
+            new GroupLocalEntity{ Id = 1, Name = "ИП1-21" },
+            new GroupLocalEntity{ Id = 2, Name = "ИП1-22" },
+            new GroupLocalEntity{ Id = 3, Name = "ИП1-23" },
+        };
+
+        public static IEnumerable<UserLocalEnity> users => new List<UserLocalEnity>
+        {
+            new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio", GroupID = 1 },
+            new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio1", GroupID = 2 },
+            new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio2", GroupID = 3 },
+            new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio3", GroupID = 1 },
+            new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio4", GroupID = 2 },
+            new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio5", GroupID = 3 },
+        };
+    }
+}

Demo/Data/Repository/UserRepositoryImpl.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.Data.Repository
+{
+    internal class UserRepositoryImpl
+    {
+    }
+}

Demo/Demo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Data\RemoteData\" />
+    <Folder Include="Domain\UseCase\" />
+  </ItemGroup>
+
+</Project>

Demo/Domain/Models/Group.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.domain.Models
+{
+    public class Group
+    {
+        public required int Id { get; set; }
+        public required string Name { get; set; }
+    }
+}

Demo/Domain/Models/Presence.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.domain.Models
+{
+    public class Presence
+    {
+
+        public required User User { get; set; }
+        public bool IsAttedance { get; set; } = true;
+        public required DateOnly Date { get; set; }
+
+        public required int LessonNumber { get; set; }
+    }
+}

Demo/Domain/Models/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.domain.Models
+{
+    public class User
+    {
+        public required string FIO { get; set; }
+        public Guid Guid { get; set; }
+
+        public required Group Group { get; set; }
+    }
+}

Demo/Program.cs

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+