After cloning repository. From the repository directory, run
$ npm install
$ node index.js
Navigate to localhost:8000 in your browser to get up and running
GET /api/v1/add?a=10&b=5
GET /api/v1/subtract?a=10&b=5
GET /api/v1/multiply?a=10&b=5
GET /api/v1/divide?a=10&b=5