* Add Clojure icon SVG
Based on the SVG found on wikimedia:
https://commons.wikimedia.org/wiki/File:Clojure_logo.svg
* Add Clojure icon details
Added the icon details for Clojure. As no official guidelines on what
color to use are given, I went with the (dark)blue color of the logo, as
I personally associate blue with Clojure more then green.
