From the docs about creating templates:
You can edit the templates available on this tab to modify how WebStorm generates these constructs, but you cannot create new ones. To create custom code snippets, use live templates.
That's inconvenient - and seems like a strange limitation to put. Yes lives templates are nice, but what prevents Webstorm from being able to let us add file templates? Any work around (other than creating the file, then separately using code snippets within that new file)?