[dotnet] Add dotnet projects and examples

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

dotnet/testing/KlipsConsole/KlipsConsole.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <ProjectReference Include="..\KlipsLibrary\KlipsLibrary.csproj" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

dotnet/testing/KlipsConsole/Program.cs

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+using KlipsLibrary;
+
+Klips.SayHello();
+
+int[] arr = { 2, 4, 6, 2, 1, 44, 10 };
+Klips.Print(arr);
+
+Console.WriteLine();
+HashSet<string> set = new HashSet<string>(){ "hi", "my", "name", "is", "shaun" };
+Klips.Print(set);
+Console.WriteLine();
+
+// Test other C# containers
+Klips.TestContainers();