initial upload of extension sample

node_modules/_base/srv/admin-service.cds

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+using { sap.capire.bookshop as my } from '../db/schema';
+
+//service AdminService @(requires:'admin') {
+service AdminService {
+  entity Books as projection on my.Books;
+  entity Authors as projection on my.Authors;
+}

node_modules/_base/srv/cat-service.cds

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+using { sap.capire.bookshop as my } from '../db/schema';
+service CatalogService @(path:'/browse') {
+
+  /** For displaying lists of Books */
+  @readonly entity ListOfBooks as projection on Books
+  excluding { descr };
+
+  /** For display in details pages */
+  @readonly entity Books as projection on my.Books { *,
+    author.name as author
+  } excluding { createdBy, modifiedBy };
+
+  //@__requires: 'authenticated-user'
+  action submitOrder ( book: Books:ID, amount: Integer ) returns { stock: Integer };
+  event OrderedBook : { book: Books:ID; amount: Integer; buyer: String };
+}

node_modules/_base/srv/mashup.cds

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+////////////////////////////////////////////////////////////////////////////
+//
+//    Mashing up imported models...
+//
+
+using { sap.capire.bookshop.Books } from '../db/schema';
+
+//
+//  Extend Books with access to Reviews and average ratings
+//
+
+/*
+using { ReviewsService.Reviews } from '@capire/reviews';
+extend Books with {
+  reviews : Composition of many Reviews on reviews.subject = $self.ID;
+  rating  : Decimal;
+}
+*/
+
+//
+//  Extend Orders with Books as Products
+//
+
+using { sap.capire.orders.Orders_Items } from '../db/schema';
+extend Orders_Items with {
+  book : Association to Books on product.ID = book.ID
+}

node_modules/_base/srv/orders-service.cds

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+using { sap.capire.orders as my } from '../db/schema';
+
+service OrdersService {
+  entity Orders as projection on my.Orders;
+}