Add cherry pick example file

cherry_pick.rb

+class Person
+  attr_reader :name, :email
+
+  def initialize(name, email)
+    @name  = name
+    @email = email
+  end
+
+  # Duplicate attr_readers.
+  # TODO: Remove these comments and the 2 methods below.
+  def name
+    @name
+  end
+
+  def email
+    @email
+  end
+end