Add foods by scanning barcodes

The OFF app has the ability to scan products, so I'm assuming the API exists. This would make using the app so much easier.

To comply with CONTRIBUTING.md: Android 11 Pixel 2 XL

[christianfl]

The API address is: https://world.openfoodfacts.org/api/v0/product/<BARCODE>.json

Or with some tasty placeholder: https://world.openfoodfacts.org/api/v0/product/4316268625876.json