This TYPO3 extension integrates the Twig template engine.
You can use composer to install the extension. If you are not familiar using composer together with TYPO3 CMS you can find a how to on the TYPO3 website.
Install the extension with the following composer command:
composer require comwrap/typo3-twig_for_typo3
You can read the documentation on typo3.org.