Adam Blog is a minimal clear theme for Jekyll

Demo
Check the theme in action Demo
The main page would look like this:

The post page would look like this:

Features
Installation:
Fork the master branch and delete gh-pages branch in it. This is important because gh-pages branch is used here only to host the blog. You should be using the master branch as the source and create a fresh gh-pages branch.
License
GNU General Public License v3.0