def add_recipient(recepient = {})
      if recepient.is_a?(String)
        # convert string value to correct hash
        recepient = {phone: recepient}
      end
      recepient[:phone] = format_phone(recepient[:phone])
      @recepients.push(recepient)
      # time-send format: YYYY-MM-DD HH:MM
      # validity_period format: YYYY-MM-DD HH:MM
    end
def add_recipient(recepient = {})
      if recepient.is_a?(String)
        # convert string value to correct hash
        recepient = {phone: recepient}
      end
      recepient[:phone] = format_phone(recepient[:phone])
      @recepients.push(recepient)
      # time-send format: YYYY-MM-DD HH:MM
      # validity_period format: YYYY-MM-DD HH:MM
    end
add recepient
 recepient (Hash or String) options for recipient
 allowed options are:
   phone: phone number
   client_id: sms id in your system
   time_send: Time of sms sending
   validity_period: Date of
 if String is given than it means only phone