add pdf generation

lib/pdf_icons.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module PdfIcons
+  PATH = Rails.root.join('lib/pdf_icons')
+
+  module_function
+
+  def check_io
+    @check_io ||= StringIO.new(PATH.join('check.png').read)
+  end
+
+  def paperclip_io
+    @paperclip_io ||= StringIO.new(PATH.join('paperclip.png').read)
+  end
+end