Make books location more explicit

ilias-bikenov · tshemsedinov · commit cebdb96964b6 · 2023-09-06T23:54:47.000+03:00
diff --git a/README.md b/README.md
@@ -4,6 +4,8 @@
 
 [Index EN](content/en/Index.md) | [Оглавление RU](content/ru/Index.md) | [Зміст UK](content/uk/Index.md) | [Obsah CZ](content/cz/Index.md)
 
+Generated books are located in */release* folder
+
 To build pdf file run:
 
 ```
