Add badges to the README

Author: allejo

README.md

@@ -1,5 +1,9 @@
 # Jekyll Docs Theme
 
+[![Gem](https://img.shields.io/gem/v/jekyll-docs-theme)](https://rubygems.org/gems/jekyll-docs-theme)
+[![GitHub release (latest by date including pre-releases)](https://img.shields.io/github/v/release/allejo/jekyll-docs-theme?include_prereleases)](https://github.com/allejo/jekyll-docs-theme/releases)
+[![GitHub license](https://img.shields.io/github/license/allejo/jekyll-docs-theme)](https://github.com/allejo/jekyll-docs-theme/blob/master/LICENSE.md)
+
 A Jekyll theme inspired by Bootstrap's official documentation theme from a few years back. This theme started off by stealing all of Bootstrap Docs' CSS and being used in [mistic100's theme](https://github.com/mistic100/jekyll-bootstrap-doc). This theme has since be rewritten from scratch and remains solely inspired by the original design.
 
 This theme is designed for writing documentation websites instead of having large unmaintainable README files or several markdown files inside of a folder in a repository.