Add project files.

Tester/Tester.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>net6.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<RootNamespace>CMM.Tester</RootNamespace>
+		<Product>ControlMyMonitorManagement</Product>
+		<Company>Dang</Company>
+		<IsPackable>false</IsPackable>
+		<Copyright>Copyright © DangWang $([System.DateTime]::Now.ToString(yyyy))</Copyright>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+		<PackageReference Include="NUnit" Version="3.13.3" />
+		<PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+		<PackageReference Include="NUnit.Analyzers" Version="3.3.0" />
+		<PackageReference Include="coverlet.collector" Version="3.1.2" />
+	</ItemGroup>
+
+</Project>

Tester/UnitTest1.cs

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+namespace CMM.Tester
+{
+    public class Tests
+    {
+        [SetUp]
+        public void Setup()
+        {
+        }
+
+        [Test]
+        public void Test1()
+        {
+            Assert.Pass();
+        }
+    }
+}

Tester/Usings.cs

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+global using NUnit.Framework;