add mocked auth

media-store/srv/invoices-service.cds

@@ -0,0 +1,12 @@
+using {sap.capire.media.store as my} from '../db/schema';
+
+@(requires : 'authenticated-user')
+service InvoicesService {
+    @readonly
+    entity Invoices     as projection on my.Invoices actions {
+        action invoice();
+    }
+
+    @readonly
+    entity InvoiceItems as projection on my.InvoiceItems;
+}