feat(invoice): add send route

pkg/invoice/model/model.go

@@ -0,0 +1,15 @@
+package model
+
+type Entity struct {
+	Name    string  `json:"name"`
+	Address Address `json:"Address"`
+	Contact string  `json:"contact"`
+	IBAN    string  `json:"iban,omitempty"`
+}
+type Address struct {
+	Street  string `json:"street"`
+	Number  string `json:"number"`
+	ZIPCode string `json:"zipCode"`
+	Place   string `json:"place"`
+	Country string `json:"country"`
+}