Add 'PHP-twig for atom' package to IDEs support

doc/templates.rst

@@ -58,6 +58,7 @@ Many IDEs support syntax highlighting and auto-completion for Twig:
 * *Komodo* and *Komodo Edit* via the Twig highlight/syntax check mode
 * *Notepad++* via the `Notepad++ Twig Highlighter`_
 * *Emacs* via `web-mode.el`_
+* *Atom* via the `PHP-twig for atom`_
 
 Variables
 ---------
@@ -871,3 +872,4 @@ Extension<creating_extensions>` chapter.
 .. _`Notepad++ Twig Highlighter`: https://github.com/Banane9/notepadplusplus-twig
 .. _`web-mode.el`:                http://web-mode.org/
 .. _`regular expressions`:        http://php.net/manual/en/pcre.pattern.php
+.. _`PHP-twig for atom`:          https://github.com/reesef/php-twig