Создайте репозиторий который содержит объект calculator (калькулятор) с тремя методами:
read() (читать) запрашивает через библиотеку readline-sync два значения и сохраняет их как свойства объекта с именами a и b. sum() (суммировать) возвращает сумму сохранённых значений. mul() (умножить) перемножает сохранённые значения и возвращает результат.
При выполнении задания опирайтесь на https://github.com/hexlet-boilerplates/nodejs-package
https://learn.javascript.ru/object-methods - подсказка
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