Expose the library as a CLI

[germanattanasio]

Users should be able to install the library. Set it up with some credentials and get results using the terminal.

Libraries that we can use for this:

• https://github.com/SBoudrias/Inquirer.js
• https://github.com/tj/commander.js/
• https://github.com/substack/minimist
• https://github.com/sindresorhus/ora#readme
• https://github.com/chalk/chalk

[germanattanasio]

will be fixed with #6