Setup and files.

Do composer install to get dependency.

create-instance.php

Creates new droplet and output ip address. It requires two environment variables:

1. DO_ACCESS_TOKEN - Digital ocean access token.
2. DO_OS - Operating system. You can get list of available os from here.

It also creates new file called droplet.json which saves droplet id in it.

destroy.php

Deletes droplet specified in droplet.json and also deletes file droplet.json.