As this is intended to build ACME clients, there is not a simple 2-line example.
I'd recommend first running the example CLI client with a test domain and then investigating the files used for that example:
```bash
node examples/cli.js
```
The example cli has the following prompts:
Summary of spec that I'm working off of here: https://git.coolaj86.com/coolaj86/greenlock.js/issues/5#issuecomment-8
```
What web address(es) would you like to get certificates for? (ex: example.com,*.example.com)
What challenge will you be testing today? http-01 or dns-01? [http-01]
What email should we use? (optional)
What API style would you like to test? v1-compat or promise? [v1-compat]
Put the string 'mBfh0SqaAV3MOK3B6cAhCbIReAyDuwuxlO1Sl70x6bM.VNAzCR4THe4czVzo9piNn73B1ZXRLaB2CESwJfKkvRM' into a file at 'example.com/.well-known/acme-challenge/mBfh0SqaAV3MOK3B6cAhCbIReAyDuwuxlO1Sl70x6bM'