add emails for newsletter

app/admin/emails.rb

@@ -0,0 +1,22 @@
+ActiveAdmin.register Email do
+    csv do
+      column :email
+      # preserve case
+    end
+    # See permitted parameters documentation:
+    # https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
+    #
+    # Uncomment all parameters which should be permitted for assignment
+    #
+    permit_params :email
+    #
+    # or
+    #
+    # permit_params do
+    #   permitted = [:title, :description, :email, :phone]
+    #   permitted << :other if params[:action] == 'create' && current_user.admin?
+    #   permitted
+    # end
+    
+  end
+