docs: add other possible cases to generate in project readme

Author: neilhem

packages/@angular/cli/blueprints/ng/files/README.md

@@ -8,7 +8,7 @@ Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app w
 
 ## Code scaffolding
 
-Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|module`.
+Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
 
 ## Build