add .env section on package.json

Author: ricardo-devis-agullo

website/docs/components/package.json-structure.md

@@ -38,6 +38,7 @@ The basic package file `package.json` looks as follows:
 | `oc`                             | `object`           | the data involved with the component                                                                                                                                           |
 | `oc.container`                   | `boolean`          | forces the component to be server-side rendered without being wrapped inside the `<oc-component />` tag.                                                                       |
 | `oc.files`                       | `object`           | non-static component files                                                                                                                                                     |
+| `oc.files.env`                   | `object`           | optional path for a .env file with environment variables                                                                                                                                                 |
 | `oc.files.data`                  | `string`           | the model provider's filename, by default `server.js`                                                                                                                          |
 | `oc.files.template`              | `object`           | represents the data involved with template - view, template engine                                                                                                             |
 | `oc.files.template.src`          | `string`           | the view's filename, by default template.html                                                                                                                                  |