This is a bare-minimum template to create a Jekyll site that uses the Just the Docs theme. You can easily set the created site to be published on GitHub Pages – the README file explains how to do that, along with other details.
Start by following the instructions in the README and then browse the Just the Docs documentation to learn more about how to use this theme.
Remember that you will be using Markdown Syntax rather than raw HTML to format the content of your pages.