Update README.md

Author: monkstone

library/library_proxy/README.md

@@ -1,4 +1,6 @@
 ### Using the LibraryProxy in your sketches
+LibraryProxy is a [abstract java class](https://github.com/ruby-processing/JRubyArt/blob/master/src/monkstone/core/LibraryProxy.java) so that you can acccess vanilla processing library reflection methods in you sketches using ruby.
+
 In the sketch you should `load_library :library_proxy` and your library class should inherit 
 from LibraryProxy and implement pre(), draw() and post() methods (can be empty method if not 
 required). For simplicity initialize your `processing library` in the sketch `setup`.
@@ -94,4 +96,4 @@ end
 # does nothing here see custom_array.rb
 def draw
 end
-```
+```