code: def execute
        File.open(outfile, 'w') do |out|
          if position.downcase == 'bottom'
            out.puts File.read(infile)
            out.puts File.read(insert)
          else
            out.puts File.read(insert)
            out.puts File.read(infile)
          end
        end
      end
docs: Creates an Inserter and takes options infile, outfile, insert-file and position where to
   insert the insert-file content. Default position is top
   Inserts the content of the insert-file at the specified positions (top or bottom)