Create README.md

Author: monkstone

external_library/gem/joonsrenderer/README.md

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+### Source of sketches ###
+The current sketches are mainly variants on vanilla processing sketches by Joon Hyub Lee, creator of the Joons renderer libray, but you do not to install the vanilla processing library just install the joonsrenderer gem.  
+
+### Joons Renderer Gem ###
+This includes a modified version of the original Joons Library (and the interface is currently compatible with the original), but also includes an updated version of sunflow (jdk-8 and latest janino). To use the gem
+```ruby
+require 'joonsrenderer'
+include_package 'joons' # this needs to in a module which is done automatically JRubyArt but not for propane