[FW-B2/ret] Correct README.md file

Add link to "final-view" img.

Worth noting:
  - that this is a realization of the "Blanchard" landing.

core: B-2 / WL-BL

Author: matowdev

core-courses/2-web-layout-basic-level/20_Final_work/README.md

@@ -21,6 +21,12 @@
 
 ---
 
+### Внешний вид приложения
+
+![Blanchard - художественная галерея](https://github.com/matowdev/fullstack-js-by-skillbox/blob/d7acc3869bdc10e48efb2621a94bb9a71f0e8997/core-courses/2-web-layout-basic-level/20_Final_work/images/final-view.png?raw=true)
+
+---
+
 ### Используемые технологии и библиотеки
 
 #### Front-end: