Added bookshopper app README for more info

bookshopper-cpp/README.md

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+<h1 align="center"> 
+	<img src=".github/pictures/bookshopper-menu-title.png" align="center" height="130"> 
+	<br>
+	<font size="4"> Bookshopper application </font>
+</h1>
+
+## Table of Contents
+
+
+- [Details](#details)
+- [Get the app](#get-the-app)
+	- [Downloading](#-downloading-)
+	- [Installing](#-installing-)
+	- [Running](#-running-)
+- [Usage](#usage)
+
+## Details
+
+A bookshop management application.
+
+The app is meant to help bookshop owners manage their books better and help clients manage their shopping carts, to keep track of the books taken for rental.
+
+It allows storing of information about books in the shop, helps manage them and acts like a small database manager for books.
+
+__Notes__: For now, only a _Command-Line Interface_ (CLI) is available for the app.
+
+## Get the app
+
+__Note__: for now, only the linux version of the app is supported, though it should run an all Unix-like operating systems.
+
+<h4 align="center"> Downloading: </h4>
+
+__Linux__: To download the app, got to the [release page](https://github.com/adipopbv/bookshopper/releases) and select the wanted version for downloading ([latest](https://github.com/adipopbv/bookshopper/releases/latest) version is recomended).
+
+<h4 align="center"> Installing: </h4>
+
+__Linux__: No installation is required. Just move the downloaded binary file wherever you like (recomended to ~/.local/bin for a 'this user' only install).
+
+<h4 align="center"> Running: </h4>
+
+__Linux__: 
+* If the install location is in the <code>$PATH</code> variable, you can run the app by typing <code>bookshopper</code> in a command-line environment like a terminal emulator or a tty.
+* If the install location is not in the <code>$PATH</code> variable, you need to provide the relative (or absolute) path to the binary file in the command-line environment of your choice.
+
+## Usage
+
+The app displays a menu after each operation, presenting all posible operations.
+
+To select an operation, type the command number indicating the wanted operation and press <code>Enter</code> or <code>Return</code>.
+
+A book has some fields: _title_, _author_, _genre_, _release year_ and is uniqely identified by _**title**_ and _**author**_. Within the app you can do the following operations:
+> 1. Display the full list of books
+
+> 2. Basic operations:
+>    * Add book
+>    * Modify book
+>    * Delete book
+<img src=".github/pictures/bookshopper-menu-main.png" align="right" height="350px">
+
+> 3. Search book (by any fields)
+
+> 4. Filter books by:
+>    * Title
+>    * Release year
+
+> 5. Sort books by:
+>    * Title
+>    * Author
+>    * Release year and genre
+
+> 6. Undo add/modify/delete book operations
+
+> 7. Shopping cart operations:
+>    * List books in cart
+>    * Empty the shopping cart
+>    * Add book to cart (by title)
+>    * Add random books to cart
+>    * Export cart as CVS
+>    * List titles
+
+A more elaborate manual will be added to the [wiki](https://github.com/adipopbv/bookshopper/wiki) if decided necessary.