The README doesn't say how to install Jekyll (or that it assumes you have Ruby to install it). Update the README and include a Gemfile to install Jekyll following the example in the [GitHub Pages docs](https://help.github.com/articles/setting-up-your-github-pages-site-locally-with-jekyll/#step-2-install-jekyll-using-bundler).
The README doesn't say how to install Jekyll (or that it assumes you have Ruby to install it).
Update the README and include a Gemfile to install Jekyll following the example in the GitHub Pages docs.