Add Julia Beginner Course + Julia Section (#7803)

* Add Julia Course

* Fix Julia Course Title

courses/free-courses-en.md

@@ -49,6 +49,7 @@
     * [Redux](#redux)
     * [Svelte](#svelte)
     * [Vue.js](#vuejs)
+* [Julia](#julia)   
 * [Kotlin](#kotlin)
 * [Kubernetes](#kubernetes)
 * [Linux](#linux)
@@ -770,6 +771,11 @@
 * [Vuex for Everyone](https://vueschool.io/courses/vuex-for-everyone)
 
 
+### Julia
+
+* [Julia Tutorials (Basic)](https://www.youtube.com/playlist?list=PLP8iPy9hna6SCcFv3FvY_qjAmtTsNYHQE) - The Julia Programming Language (YouTube)
+
+
 ### Kotlin
 
 * [Advanced Android with Kotlin](https://www.udacity.com/course/advanced-android-with-kotlin--ud940) (Udacity)