Update free-programming-books.md (#2625)

* Update free-programming-books.md

Added Django Girls tutorial. Since it's not an interactive tutorial i have added it to books section.

* Update free-programming-books.md

Moved Django Girls Tutorial to the top of the Django books list according to alphabetic order.

free-programming-books.md

@@ -1943,6 +1943,7 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 
 #### Django
 
+* [Django Girls Tutorial](https://tutorial.djangogirls.org/en/) (1.11)
 * [Django Official Documentation](https://media.readthedocs.org/pdf/django/1.5.x/django.pdf) (PDF) (1.5)
 * [Django Official Documentation](https://media.readthedocs.org/pdf/django/1.7.x/django.pdf) (PDF) (1.7)
 * [Django Official Documentation](https://media.readthedocs.org/pdf/django/1.9.x/django.pdf) (PDF) (1.9)