Add UnitTest

UnitTest/.gitignore

@@ -0,0 +1,3 @@
+/bin
+/obj
+/*.csproj.user

UnitTest/UnitTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0-windows</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
+    <PackageReference Include="coverlet.collector" Version="3.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Netch\Netch.csproj" />
+  </ItemGroup>
+
+</Project>

UnitTest/UnitTest1.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace UnitTest
+{
+    [TestClass]
+    public class UnitTest1
+    {
+        [TestMethod]
+        public void TestMethod1()
+        {
+        }
+    }
+}