code: func (group *RouterGroup) Static(relativePath, root string) IRoutes {
  	return group.StaticFS(relativePath, Dir(root, false))
  }
docs: // Static serves files from the given file system root.
  // Internally a http.FileServer is used, therefore http.NotFound is used instead
  // of the Router's NotFound handler.
  // To use the operating system's file system implementation,
  // use :
  //     router.Static("/static", "/var/www")