Update README.md

Author: 94noni

README.md

@@ -20,6 +20,7 @@ Documentation
 
 * Read the [Getting Started guide][7] if you are new to Symfony.
 * Try the [Symfony Demo application][23] to learn Symfony in practice.
+* Discover Symfony ecosystem in detail with [Symfony The Fast Track][26].
 * Master Symfony with the [Guides and Tutorials][8], the [Components docs][9]
   and the [Best Practices][10] reference.
 
@@ -74,3 +75,4 @@ Symfony development is sponsored by [SensioLabs][21], led by the
 [23]: https://github.com/symfony/symfony-demo
 [24]: https://symfony.com/coc
 [25]: https://symfony.com/doc/current/contributing/code_of_conduct/care_team.html
+[26]: https://symfony.com/book