[gthumb] added extensions documentation

[Michael J. Chudobiak <mjc src gnome org>]

commit 9e660e7282ebcb970d3c0b41f86d1360be7370f1
Author: Michael J. Chudobiak <mjc avtechpulse com>
Date:   Fri Jun 25 10:35:18 2010 -0400

    added extensions documentation

 help/C/extensions.page   |   20 ++++++++++++++++++++
 help/C/introduction.page |    2 +-
 help/Makefile.am         |    3 ++-
 3 files changed, 23 insertions(+), 2 deletions(-)
---
diff --git a/help/C/extensions.page b/help/C/extensions.page
new file mode 100644
index 0000000..5772c76
--- /dev/null
+++ b/help/C/extensions.page
@@ -0,0 +1,20 @@
+<page xmlns="http://projectmallard.org/1.0/"; type="topic"
+id="gthumb-extensions">
+  <info>
+    <link type="guide" xref="index#welcome" />
+  </info>
+  <title>Extending gThumb</title>
+  <p><app>gThumb</app> has a plug-in system for extensions. Some standard
+  features are implemented as extensions and are supplied with the standard
+  distribution. Users may write (and share) additional extensions.</p>
+  <p>You can enable or disable extensions using
+  <guiseq><gui>Edit</gui><gui>Extensions</gui></guiseq>. Some extensions
+  will have <gui>Preferences</gui> that can be modified from this dialog.</p>
+  <p>This manual is written with the assumption that the standard extensions
+  are enabled. If you seem to be missing a feature, check to see which
+  extensions are actually enabled.</p>
+  <p>If you would like to write your own extension, please visit
+  <link href="http://live.gnome.org/gthumb";>http://live.gnome.org/gthumb</link>
+  for development information. An example extension is provided in the source
+  code, which you can base your own extension on.</p>
+</page>
diff --git a/help/C/introduction.page b/help/C/introduction.page
index 40bd463..a511c3a 100644
--- a/help/C/introduction.page
+++ b/help/C/introduction.page
@@ -3,7 +3,7 @@ id="gthumb-introduction">
   <info>
     <link type="guide" xref="index#welcome" />
   </info>
-  <title>Introduction</title>
+  <title>About gThumb</title>
   <p><app>gThumb</app> is an image viewer and browser written for the GNOME
   environment. It lets you browse your hard disk, showing you
   thumbnails of image files and view single images of many
diff --git a/help/Makefile.am b/help/Makefile.am
index e62b778..7094548 100644
--- a/help/Makefile.am
+++ b/help/Makefile.am
@@ -30,7 +30,8 @@ DOC_PAGES = \
 	edit-colors.page \
 	edit-rotate.page \
 	edit-resize-crop.page \
-	edit-redeye.page
+	edit-redeye.page \
+	extensions.page
 	
 DOC_LINGUAS = de el es fr oc sl sv zh_CN