Added new resource for Django (#5922)

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-es.md

@@ -337,6 +337,7 @@
 
 #### Django
 
+* [Guía Oficial de Django](https://docs.djangoproject.com/es/3.2/) (3.2) (HTML)
 * [Tutorial de Django Girls](https://tutorial.djangogirls.org/es/) (2.2.4) (HTML)