feat: initial config command implementation

src/AltGen.Console/Common/HostBuilderExtensions.cs

@@ -6,6 +6,9 @@ static class HostBuilderExtensions
   {
     var registrar = new TypeRegistrar(builder);
     var app = new CommandApp<GenerateCommand>(registrar);
+
+    app.Configure(static c => c.AddCommand<ConfigCommand>("config"));
+
     return app;
   }
 }