add a tips and tricks section for video integration

Author: OlivierJourdan

en/modules/ROOT/pages/contributing.adoc

@@ -83,4 +83,19 @@ The <<kbd-shortcut-code>> is rendered below.
 
 ====
 Press kbd:[Ctrl-H] to bring up the context help window.
-====
+====
+
+== Asciidoc Syntax tips and tricks
+
+=== Inserting a Youtube video
+
+.YouTube video integration
+[source#video]
+[source,asciidoc]
+----
+video::mFiS5q8AXyg[youtube]
+----
+
+The <<video>> is rendered below.
+
+video::mFiS5q8AXyg[youtube]