I created a module in odoo community edition that is used to work with invoices. Invoices have different stages, such as draft, awaiting approval and done. How to add these stages to the list view that will display how many invoices are in each of the stage? Similar to how it's done in Purchase module. In Purchase module, where it says All RFQs, and in boxes it counts how many to send, how many are waiting and how many are late.