A crate to generate PDF invoices.
To be used with a directory structure like
├── 2017
| ├── invoices.csv (list of invoices)
| └── data.csv (list of line items)
├── 2018
| ├── invoices.csv (list of invoices)
| └── data.csv (list of line items)
├── businesses.csv (you; possibly with different legal setups or addresses)
├── clients.csv (your clients)
└── invoice.css (your style)