doc-rst: add stand-alone conf.py to media folder

With the media/conf.py, and media/index.rst the media folder can be
build and distributed stand-alone.

Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/media/index.rst b/Documentation/media/index.rst
new file mode 100644
index 0000000..e85c557
--- /dev/null
+++ b/Documentation/media/index.rst
@@ -0,0 +1,12 @@
+Linux Media Subsystem Documentation
+===================================
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   media_uapi
+   media_kapi
+   dvb-drivers/index
+   v4l-drivers/index