[dotnet] Add dotnet projects and examples

+ Sitemap generator I created while learning the dispose pattern
+ Testing project for learning general C#

dotnet/testing/KlipsLibrary.Test/KlipsLibrary.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\KlipsLibrary\KlipsLibrary.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/testing/KlipsLibrary.Test/UnitTest1.cs

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+using Xunit;
+
+namespace KlipsLibrary.Test;
+
+public class UnitTest1
+{
+    [Fact]
+    public void DogTest()
+    {
+        var dog = new Dog("Buford", "Woof");
+        Assert.Equal("Buford", dog.Name);
+        dog.Speak();
+    }
+    
+    [Fact]
+    public void HumanTest()
+    {
+        var human = new Human("Shaun", "Hi");
+        Assert.Equal("Shaun", human.Name);
+        human.Speak();
+    }
+}