updated readme

db/seeds.rb

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+# This file should contain all the record creation needed to seed the database with its default values.
+# The data can then be loaded with the rake db:seed (or created alongside the db with db:setup).
+#
+# Examples:
+#
+#   cities = City.create([{ :name => 'Chicago' }, { :name => 'Copenhagen' }])
+#   Mayor.create(:name => 'Daley', :city => cities.first)