Provide a link to Symfony client download instructions

Make it clearer how to install the Symfony web server directly from the Installing & Setting up the Symfony Framework page.

Author: danabrey

setup.rst

@@ -39,7 +39,7 @@ Running your Symfony Application
 On production, you should use a web server like Nginx or Apache (see
 :doc:`configuring a web server to run Symfony </setup/web_server_configuration>`).
 But for development, it's more convenient to use the
-:doc:`Symfony Local Web Server <setup/symfony_server>`.
+:doc:`Symfony Local Web Server <setup/symfony_server>`. For installation instructions, see `Download the Symfony client`_.
 
 This local server provides support for HTTP/2, TLS/SSL, automatic generation of
 security certificates and many other features. It works with any PHP application,
@@ -153,6 +153,7 @@ Go Deeper with Setup
 .. _`Stellar Development with Symfony`: http://symfonycasts.com/screencast/symfony
 .. _`Composer`: https://getcomposer.org/
 .. _`installing Composer`: https://getcomposer.org/download/
+.. _`Download the Symfony client`: https://symfony.com/download
 .. _`the Security Checker`: https://github.com/sensiolabs/security-checker#integration
 .. _`The Symfony Demo application`: https://github.com/symfony/demo
 .. _`symfony/symfony-demo`: https://github.com/symfony/demo