Doc: Add ability to generate documentation for the module.

-Added targets so that "make docs" will generate the
documentation.

Change-Id: I16a74d7e15e12df16570f110c7e67a110d53afad
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

doc/config/qtmultimedia-dita.qdocconf

@@ -0,0 +1,32 @@
+# Name of the project.
+project = Qt Multimedia
+
+# Directories in which to search for files to document and images.
+# By default set to the root directory of the project for sources
+# and headers and qdoc will therefore generate output for each file.
+# Images should be placed in <rootdir>/dic/images and examples in
+# <rootdir>/examples.
+# Paths are relative to the location of this file.
+exampledirs += ../src/examples \
+               ../.. \
+               ../../examples
+
+headerdirs += ../src \
+              ../../src
+
+imagedirs += ../src/images \
+
+sourcedirs += ../src \
+              ../../src
+
+excludedirs +=
+
+#Do not change the variables after this line unless you know what you are doing.
+
+outputdir = ../ditaxml
+outputformats = DITAXML
+
+examples.fileextensions = "*.cpp *.h *.js *.svg *.xml *.ui *.qml"
+examples.imageextensions = "*.png *.jpeg *.jpg *.gif *.mng"
+headers.fileextensions = "*.h *.ch *.h++ *.hh *.hpp *.hxx"
+sources.fileextensions = "*.cpp *.qdoc *.mm *.qml"