Need an example with separate instrument step in subfolder

Imagine a repo structure like this

```
root/
  app/
    index.js
  cypress/
    integration/
      spec.js
  package.json
```

The user instruments the application in "app" folder with command like

```
nyc instrument --compact false --in-place --cwd app .
```

Need to make sure the output JSON and reports are not empty