Doc: Adding Qt Multimedia Widgets documentation.

-added landing page and module page
-linked to Qt Multimedia and Qt Widgets
-excluded multimediawidgets dir from the Qt Multimedia documentation

Task-number: QTBUG-29339
Change-Id: Iaa8dc4117505d5635b8cab97ed5c10e9c4a289e6
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>

src/multimediawidgets/doc/qtmultimediawidgets.qdocconf

@@ -0,0 +1,43 @@
+include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
+
+project                 = qtmultimediawidgets
+description             = Qt Multimedia Widgets Documentation
+url                     = http://qt-project.org/doc/qt-$QT_VER/qtmultimediawidgets
+version                 = $QT_VERSION
+
+# The following parameters are for creating a qhp file, the qhelpgenerator
+# program can convert the qhp file into a qch file which can be opened in
+# Qt Assistant and/or Qt Creator.
+
+# Defines the name of the project. You cannot use operators (+, =, -) in
+# the name. Properties for this project are set using a qhp.<projectname>.property
+# format.
+qhp.projects = qtmultimediawidgets
+qhp.qtmultimediawidgets.file = qtmultimediawidgets.qhp
+qhp.qtmultimediawidgets.namespace = org.qt-project.qtmultimediawidgets.$QT_VERSION_TAG
+qhp.qtmultimediawidgets.indexTitle = Qt Multimedia
+qhp.qtmultimediawidgets.virtualFolder  = qtmultimediawidgets
+
+# For listing child nodes in Qt Creator or Assistant.
+qhp.qtmultimediawidgets.subprojects = classes qmltypes
+qhp.qtmultimediawidgets.subprojects.classes.title = C++ Classes
+qhp.qtmultimediawidgets.subprojects.classes.indexTitle = Qt Multimedia Widgets C++ Classes
+qhp.qtmultimediawidgets.subprojects.classes.selectors = class fake:headerfile
+qhp.qtmultimediawidgets.subprojects.classes.sortPages = true
+qhp.qtmultimediawidgets.subprojects.qmltypes.title = QML Types
+qhp.qtmultimediawidgets.subprojects.qmltypes.indexTitle = Qt Multimedia Widgets QML Types
+qhp.qtmultimediawidgets.subprojects.qmltypes.selectors = fake:qmlclass
+qhp.qtmultimediawidgets.subprojects.qmltypes.sortPages = true
+
+exampledirs += ../../../examples/multimediawidgets \
+               snippets
+
+headerdirs += ../
+
+imagedirs += \
+
+sourcedirs += ../
+
+excludedirs +=
+
+depends                 += qtcore qtdoc qtquick qtqml qtmultimedia qtwidgets qtgui