moved list to parf

lib/parfait/list.rb

@@ -0,0 +1,33 @@
+class List
+
+  def initialize
+    @next = nil
+  end
+  def empty?
+    @next.nil?
+  end
+
+  def get(key)
+    @next ?  @next.get(key) : nil
+  end
+
+  def set(key , value)
+    @next ? @next.set(key,value) : @next = Node.new(key,value)
+    value
+  end
+end
+
+class Node < List
+  def initialize(key,value)
+    @key = key
+    @value = value
+  end
+  def get(key)
+    @key == key ? @value : super(key)
+  end
+  def set(key,value)
+    @key == key ? @value = value : super(key,value)
+  end
+end
+
+# https://www.youtube.com/watch?v=HJ-719EGIts