Update free-courses-en.md (#3335)

free-courses-en.md

@@ -229,6 +229,7 @@
 * [Bento JavaScript Learning Track](https://bento.io/topic/javascript) (Bento)
 * [Egghead.io](https://egghead.io)
 * [Intro to JavaScript ES6 programming](https://www.youtube.com/playlist?list=PL-xu4i_QDSxcoDNeh8rx5-pHCCTOg0XsI)
+* [Javascript Essentials](https://www.udemy.com/javascript-essentials/) - Lawrence Turton (Udemy)
 * [Learn how to program: JavaScript](https://www.learnhowtoprogram.com/javascript) - Epicodus Inc.
 * [learn:query](https://learnquery.infinum.co)