export arcball to a:wq gem

.gitignore

@@ -14,7 +14,7 @@ MANIFEST.MF
 .dat*
 .repl_history
 build/
-
+*.jar
 ## Documentation cache and generated files:
 /.yardoc/
 /_yardoc/

README.md

@@ -1,2 +1,21 @@
 # ArcBall
 ArcBall functionality for processing (ruby versions) as gem
+
+### Example Usage 
+The sketch class need to to inherit from PApplet to work and self should return such an instance. The following is a ruby-processing example, which currently supplies arcball via a library, but gem distribution has its attractions
+
+```ruby
+require 'arcball'
+
+def setup
+  size(600, 600, P3D)
+  smooth(8)
+  Processing::ArcBall.init(self, 300, 300)
+  fill 180
+end
+
+def draw
+  background(50)  
+  box(300, 300, 300)
+end
+```