Remove test.js and move example to README

Please reset your API key in your account's general settings since it looks like you exposed it in `test.js`. API keys should not be exposed as this allows a malicious person to run API calls on your behalf. If you'd like to restore `test.js` I recommend pulling the company username and API key from environment variables or representing them as I did here in the readme and then replacing them before running. Let me know if you have any questions!