Add the first julia cource (#6110)

* Add the first julia cource

* Update courses/free-courses-ru.md

Co-authored-by: David Ordás <[email protected]>

Co-authored-by: David Ordás <[email protected]>

Author: nagayev

Diff for: courses/free-courses-ru.md

@@ -12,6 +12,7 @@
 * [JavaScript](#javascript)
   * [Node.js](#nodejs)
   * [React](#react)
+* [Julia](#julia)
 * [Kotlin](#kotlin)
 * [Perl](#perl)
 * [PHP](#php)
@@ -108,6 +109,11 @@ ADV - Продвинутый. Тонкости.
 * [React.js курс для начинающих](https://max-frontend.gitbook.io/react-course-ru-v2/) (BEG)
 
 
+### Julia
+
+* [Введение в язык программирования Julia](https://github.com/YermolenkoIgor/Julia_tutorial_rus) - Igor Yermolenko (BEG)
+
+
 ### Kotlin
 
 * [Введение в Kotlin JVM](https://stepik.org/course/5448) - Stepik (BEG)