Add links to erlang resources for italian section (#4508)

* Add links to erlang resources for italian section

* Review

free-courses-it.md

@@ -11,6 +11,7 @@
 * [Delphi](#delphi)
 * [Embedded](#embedded)
   * [Arduino](#arduino)
+* [Erlang](#erlang)
 * [Generale](#generale)
 * [Java](#Java)
 * [JavaScript](#javascript)
@@ -90,6 +91,12 @@
 * [Corso Arduino 2014](https://www.youtube.com/watch?v=WuqS4C4u42E&list=PLA27EZBY5vePO9T6YP3rH8LTTdylz69VE) (POuLpolimi Politecnico di Milano)
 
 
+### Erlang
+
+* [Erlang/OTP](http://www.khaldi.it/art/erlang/erl01/E01.html) - Jilani KHALDI
+* [Iniziare con Erlang Language](https://riptutorial.com/it/erlang)
+
+
 ### Generale
 
 * [Automi e Linguaggi Formali](https://www.youtube.com/playlist?list=PLhEwqlL10MqNz1pA7R5jnB_gsMIhDOe5X) - Bresolin e Filè (Università di Padova)