Options:
-t, --template <name>        block template type name, allowed values: "es5", "esnext", or the name of an external npm package (default: "esnext")
--namespace <value>          internal namespace for the block name (cannot has number or special characters)
--category <name>            category name for the block


Examples:
$ npx @wordpress/create-block --template es5 
// use es5 language (direct javascript file)

$ npx @wordpress/create-block --template esnext 
// use esnext language (need to run npm build, has src and build directories)

npx @wordpress/create-block --namespace st_quiz --category quizzes starter-block