If you haven't already, download and install EnvKey from our website, then create a new org. Next, follow the 1 minute integration quickstart to init an app with a .envkey file (for connecting development) or generate a server ENVKEY (for connecting a server).
Using a language-specific library like this one is the easiest and fastest method of integrating with EnvKey. That said, the envkey-source executable, which this library wraps, provides additional options and functionality when used directly from the command line. If you need additional flexibility and it works for your use case, consider using envkey-source directly.