[gobject-introspection/mallard-templates] Mention g-ir-doc-tool in the README

[Tomeu Vizoso <tomeuv src gnome org>]

commit 77aca398ef4e5f0f67ed1904c670c7d2c1b4a068
Author: Tomeu Vizoso <tomeu vizoso collabora com>
Date:   Mon Feb 20 18:12:23 2012 +0100

    Mention g-ir-doc-tool in the README

 README |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index 0562c8a..2a1dd1c 100644
--- a/README
+++ b/README
@@ -37,6 +37,8 @@ Three tools are shipped with GObject Introspection:
   typelib blob.
 - g-ir-scanner, a tool which generates GIR XML files by parsing headers
   and introspecting GObject based libraries.
+- g-ir-doc-tool, generates Mallard files that can be viewed with yelp or
+  rendered to HTML with yelp-build from yelp-tools.
 
 API library
 ===========