add new migration file

db/migrate/20170126074122_add_adult_or_child_in_batches.rb

@@ -0,0 +1,5 @@
+class AddAdultOrChildInBatches < ActiveRecord::Migration[5.0]
+  def change
+  	 add_column :batches, :adult_or_child, :string ,:default => "CHILD"
+  end
+end