Create a new file named twiggy.info.yml within our new theme folder, and add the following configuration information to the file:
name: Twiggy type: theme description: 'A simple theme' core: 8.x base theme: classy libraries: - twiggy/global regions: header: Header primary_menu: 'Primary menu' secondary_menu: 'Secondary menu' breadcrumb: Breadcrumb help: Help highlighted: Highlighted content: Content sidebar_first: 'Left sidebar' sidebar_second: 'Right sidebar' footer: Footer page_top: 'Page top' page_bottom: 'Page bottom'