This example is also part of the homework 1. So some features are not all implemented. (Leave as homework)

CocoaPods is used as package manager in Cocoa and CocoaTouch development. If you never use it before, don't worry this is planned to be taught in future classes.

You can use CocoaPods to integrate this Core by adding following lines to your Podfile:

pod 'CalculatorCore', :git => 'https://github.com/sodascourse/calculator.git', :branch => 'master'

And use following line to include this core when you need it:

import CalculatorCore

Just drag this file CalculatorCore/CalculatorCore.swift into your Xcode project. Since then this core is actually part of your project, you don't need the import statement.