Initial commits

examples/Cli/Injection/Commands/DefaultCommand.cs

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+using System;
+using System.ComponentModel;
+using Spectre.Console.Cli;
+
+namespace Injection.Commands;
+
+public sealed class DefaultCommand : Command<DefaultCommand.Settings>
+{
+    private readonly IGreeter _greeter;
+
+    public sealed class Settings : CommandSettings
+    {
+        [CommandOption("-n|--name <NAME>")]
+        [Description("The person or thing to greet.")]
+        [DefaultValue("World")]
+        public string Name { get; set; }
+    }
+
+    public DefaultCommand(IGreeter greeter)
+    {
+        _greeter = greeter ?? throw new ArgumentNullException(nameof(greeter));
+    }
+
+    public override int Execute(CommandContext context, Settings settings)
+    {
+        _greeter.Greet(settings.Name);
+        return 0;
+    }
+}