Initial commits

examples/Cli/Injection/Program.cs

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+using Injection.Commands;
+using Injection.Infrastructure;
+using Microsoft.Extensions.DependencyInjection;
+using Spectre.Console.Cli;
+
+namespace Injection;
+
+public class Program
+{
+    public static int Main(string[] args)
+    {
+        // Create a type registrar and register any dependencies.
+        // A type registrar is an adapter for a DI framework.
+        var registrations = new ServiceCollection();
+        registrations.AddSingleton<IGreeter, HelloWorldGreeter>();
+        var registrar = new TypeRegistrar(registrations);
+
+        // Create a new command app with the registrar
+        // and run it with the provided arguments.
+        var app = new CommandApp<DefaultCommand>(registrar);
+        return app.Run(args);
+    }
+}