Add project files.

tUtils.sln

+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31205.134
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "tUtils", "tUtils\tUtils.csproj", "{7DFBBCC7-5C2D-4A45-A17F-F56C66F93C61}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7DFBBCC7-5C2D-4A45-A17F-F56C66F93C61}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7DFBBCC7-5C2D-4A45-A17F-F56C66F93C61}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7DFBBCC7-5C2D-4A45-A17F-F56C66F93C61}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7DFBBCC7-5C2D-4A45-A17F-F56C66F93C61}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {090BED87-1992-4F59-93EC-FDB8A349F09B}
+	EndGlobalSection
+EndGlobal

tUtils/Class1.cs

+using System;
+
+namespace tUtils
+{
+    public class Class1
+    {
+    }
+}

tUtils/tUtils.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>