docs: add instructions for creating a draft (#2009)

source/docs/commands.md

@@ -21,7 +21,7 @@ This command is a shortcut that runs the following steps:
 $ hexo new [layout] <title>
 ```
 
-Creates a new article. If no `layout` is provided, Hexo will use the `default_layout` from [_config.yml](configuration.html). If the `title` contains spaces, surround it with quotation marks.
+Creates a new article. If no `layout` is provided, Hexo will use the `default_layout` from [_config.yml](configuration.html). Use the layout `draft` to create a draft. If the `title` contains spaces, surround it with quotation marks.
 
 Option | Description
 --- | ---