add content for openSAP course week1 unit4

packages/bookshop/srv/cat-service.cds

@@ -1,7 +1,5 @@
 using { sap.capire.bookshop as my } from '../db/schema';
-
-@path:'/browse'
-service CatalogService {
+service CatalogService @(path:'/browse') {
 
   @readonly entity Books as SELECT from my.Books {*,
     author.name as author
@@ -9,5 +7,4 @@ service CatalogService {
 
   @requires_: 'authenticated-user'
   @insertonly entity Orders as projection on my.Orders;
-
-}
+}