feat: working on adding abstractions

src/BGR.Console/Common/HostBuilderExtensions.cs

@@ -0,0 +1,12 @@
+namespace BGR.Console.Common;
+
+internal static class HostBuilderExtensions
+{
+  public static CommandApp BuildApp(this IHostBuilder builder)
+  {
+    var registrar = new TypeRegistrar(builder);
+    var app = new CommandApp(registrar);
+
+    return app;
+  }
+}