Doc: image viewer

Change-Id: I18e1d269a4dd160f8c1a11a4e18efcc0629912d3
Reviewed-by: hjk <qthjk@ovi.com>

doc/src/howto/creator-ui.qdoc

@@ -158,10 +158,16 @@
     a list of all projects open in the current session. The files for each
     project are grouped according to their file type.
 
+
     You can use the project tree in the following ways:
 
     \list
 
+        \o  To open files that belong to a project, double-click them in the
+            project tree. Files open in the appropriate editor, according to the
+            file type. For example, code source files open in the code editor
+            and image files in the \l{Viewing Images}{image viewer}.
+
         \o  To bring up a context menu containing the actions most commonly
             needed right-click an item in the project tree. For example, through
             the menu of the project root directory you can, among other actions,
@@ -325,6 +331,26 @@
 
     \image qtcreator-compile-pane.png
 
+    \section1 Viewing Images
+
+    \QC opens image files in the image viewer.
+
+    \image qtcreator-image-viewer.png "Image viewer"
+
+    Use the toolbar buttons or \l{Keyboard Shortcuts}{keyboard shortcuts} to:
+
+    \list
+
+        \o  Switch between background and outline modes
+
+        \o  Zoom in and out
+
+        \o  Fit images to screen
+
+        \o  Return to original size
+
+    \endlist
+
     \section1 Navigating with Keyboard
 
     \QC caters not only to developers who are used to using the mouse,