adds simple hash and test

lib/sof/all.rb

@@ -3,6 +3,7 @@ require_relative "members"
 require_relative "volotile"
 require_relative "writer"
 require_relative "array"
+require_relative "hash"
 require_relative "occurence"
 
 Symbol.class_eval do

lib/sof/hash.rb

@@ -0,0 +1,13 @@
+Hash.class_eval do
+  def to_sof(io , members , level)
+    each_with_index do |pair , i|
+      key , object = pair
+      io.write(" " * level) unless i == 0
+      io.write "-"
+      members.output( io , key)
+      io.write( " " )
+      members.output( io , object)
+      io.write("\n")
+    end
+  end
+end