Update readme.md

clarify API only brief

Author: SallyMcGrath

E-Commerce-API/readme.md

@@ -31,6 +31,8 @@ As a developer, I want to build up my API using TDD - writing the test first and
 1. As a user, I want to delete an existing customer only if they do not have any orders.
 1. As a user, I want to view all orders with their items for a specific customer, including order references, dates, product names, unit prices, suppliers, and quantities.
 
+**These user stories describe the API. Do not build a front end or database.**
+
 ## Acceptance Criteria
 
 - [ ] Each user story has an accompanying unit test