README.md: updated todo status for punches and invoices (now done), and added a bit in History about orders/korder/invoices.
README.md: updated todo status for punches and invoices (now done), and added a bit in History about orders/korder/invoices.

mlutfy/ca.bidon.timetrack,mlutfy/ca.bidon.timetrack,mlutfy/ca.bidon.timetrack