Create Quil Clojure sample project for Installfest instructions

[bridgethillyer]

The Heroku sample Clojure project is still in the Installfest instructions.

See here:
https://github.com/ClojureBridge/curriculum/blob/master/outline/setup_osx.md#testing-your-setup

Since we do not create a web app any longer, a very simple quil app in a repository that students could clone and run would work great.

[bridgethillyer]

Related to #117

[duelinmarkers]

The one @orb created for ATX is here: https://github.com/AustinClojure/welcometoclojurebridge -- maybe that could just be moved into the ClojureBridge organization? May want Norman's opinion.