add some instructions for running it...
add some instructions for running it...

jjn2009/iruby,minrk/iruby,zalt50/iruby,domitry/iruby,minrk/iruby,mijoharas/iruby,hainesr/iruby,zalt50/iruby,SciRuby/iruby,Sharpie/iruby,SciRuby/iruby,Sharpie/iruby,minrk/iruby,hainesr/iruby,astroboxio/iruby,SciRuby/iruby,astroboxio/iruby,domitry/iruby,zalt50/iruby,Rambatino/pi-ruby,jjn2009/iruby,Rambatino/pi-ruby,SciRuby/iruby,mijoharas/iruby,zalt50/iruby