Created intro text of the Twig Reference

wouterj · wouterj · commit 8e53c1651c76 · 2012-11-01T18:51:27.000+01:00
diff --git a/reference/twig_reference.rst b/reference/twig_reference.rst
@@ -0,0 +1,14 @@
+.. index::
+    single: Symfony2 Twig extensions
+
+Symfony2 Twig Extensions
+========================
+
+Twig is the default template engine for Symfony2. It contains a lot of build-in
+functions, filters and blocks. Symfony2 created some custom extension on
+top of Twig to integrate some components into the Twig templates.
+
+Below is information about all the custom functions, filters and blocks
+that are defined by the Symfony2 Core Framework. There may also be tags
+in bundles that are included within the Symfony Standard Edition, or in
+bundles you use, that aren't listed here.
