Update README: add images, update content layout

README.md

@@ -1,12 +1,6 @@
 # Java Bookstore Project
 
-![](sample_0.png)
-
-_Front-end view_
-
-![](db_plans/sample_1.png)
-
-_[Database structure](db_plans/bookstore-model.mwb)_
+## Introduction
 
 - This repository contains school-related Java server-side project work for an imaginary book store with required/necessary back-end features & course requirement description.
 
@@ -16,14 +10,57 @@ _[Database structure](db_plans/bookstore-model.mwb)_
 
 - This repository, although it contains references to my website domain (`com.fjordtek`), is not in production use in my [public server environment](https://fjordtek.com).
 
+## Overview
+
+### Front page
+
+![](images/page_home.png)
+
+_Front-end home page view with user sign-in form._
+
+------------------------------
+
+### Normal user view
+
+![](images/page_user_front.png)
+
+_Normal user view for the bookstore: get basic information of published books._
+
+------------------------------
+
+### Sales manager view
+
+![](images/page_salesmanager_front.png)
+
+_Sales manager view for the bookstore: view, edit and add books. Get published and unpublished books._
+
+------------------------------
+
+### Administration view
+
+![](images/page_admin_front.png)
+
+_Administration view for the bookstore: view, edit, delete and add books. Get published and unpublished books. Access REST API._
+
+------------------------------
+
+### Database structure
+
+![](images/db_structure.png)
+
+_[Bookstore database structure](db_plans/bookstore-model.mwb)_
+
+------------------------------
+
 ## Repository structure
 
 
-| **Type** |        **Name**         |        **Description**      |
-|----------|-------------------------|-----------------------------|
-| `Folder` | [bookstore](bookstore)  | Main project folder (Maven) |
-| `Folder` | [packaging](packaging)  |  OS-specific build scripts  |
-| `Folder` |  [db_plans](db_plans)   | SQL Database plans & drafts |
+| **Type** |        **Name**         |        **Description**       |
+|----------|-------------------------|------------------------------|
+| `Folder` | [bookstore](bookstore)  |  Main project folder (Maven) |
+| `Folder` | [packaging](packaging)  |  OS-specific build scripts   |
+| `Folder` |  [db_plans](db_plans)   |  SQL Database plans & drafts |
+| `Folder` |    [images](images)     | Various screenshots & images |
 
 ### Recommendations