Add picture: database structure

README.md

@@ -2,6 +2,12 @@
 
 ![](sample_0.png)
 
+_Front-end view_
+
+![](sample_1.png)
+
+_Database structure_
+
 - This repository contains school-related Java server-side project work for an imaginary book store with required/necessary back-end features & course requirement description.
 
 - This repository is linked to work of repository [java-server-programming - GitHub/Fincer](https://github.com/Fincer/java-server-programming).