[PW-16.7/ret] Correct README.md file

Add link to "final-view" img.

Worth noting:
  - that this is a realization of the "Euclid" web-page.

core: B-2 / WL-BL

Author: matowdev

core-courses/2-web-layout-basic-level/16_Cross_Browser/16_7_Practical_Work_16_Cross_Browser/README.md

@@ -18,6 +18,12 @@
 
 ---
 
+### Внешний вид
+
+![Euclid](https://github.com/matowdev/fullstack-js-by-skillbox/blob/06741070c74a74799901d07f8e1cc05f2f642ddd/core-courses/2-web-layout-basic-level/16_Cross_Browser/16_7_Practical_Work_16_Cross_Browser/img/final-view.png?raw=true)
+
+---
+
 ### Используемые технологии и библиотеки
 
 #### Front-end: