Add bin and edit workflow

bin/gems/facets-3.1.0/lib/standard/facets/math/amd.rb

@@ -0,0 +1,17 @@
+require 'facets/math/rmd'
+require 'facets/math/mean'
+
+module Math
+    
+  # The average absolute difference of two independent values drawn 
+  # from the sample. Equal to the RMD * mean.
+  def self.amd(array)
+	  rmd(array) * mean(array)
+  end
+
+  class << self
+    alias_method :absolute_mean_difference, :amd
+    #alias_method :md, :mean_difference
+  end
+
+end