add color group library

Author: monkstone

library/color_group/color_group.rb

@@ -0,0 +1,18 @@
+java_import Java::Monkstone::ColorUtil
+
+class ColorGroup
+  attr_reader :web_colors, :pcolors
+  def initialize(web)
+    @web_colors = web
+    @pcolors = ColorUtil.web_array(web)
+  end
+
+  def shuffle
+    @pcolors = ColorUtil.web_array(web_colors.shuffle)
+  end
+
+  def shuffle!
+    web_colors.shuffle!
+    @pcolors = ColorUtil.web_array(web_colors)
+  end
+end