docs: add Documentation/README.rst to point GitHub users to ReadTheDocs

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

kernel/Documentation/README.rst

@@ -0,0 +1,26 @@
+Documentation
+=============
+
+This documentation is avail at: `prototype-kernel.readthedocs.io`_
+
+Files in this Documentation/ directory is (like the kernel) based on
+`reStructuredText`_ files and `Sphinx`_ can be used for generating
+pretty documentation.  Just like this documentation is being
+auto-generated on `Read The Docs`_.
+
+Compiling
+---------
+
+To generate pretty `Sphinx`_ documentation locally simply run ::
+
+ make html
+
+The generate output will be located in ``_build/html/index.html``
+(`local link`_)
+
+.. _Read The Docs: https://prototype-kernel.readthedocs.io
+.. _prototype-kernel.readthedocs.io: https://prototype-kernel.readthedocs.io
+.. _Sphinx: http://www.sphinx-doc.org/
+.. _reStructuredText: http://docutils.sourceforge.net/rst.html
+.. _local link: file:///home/hawk/git/prototype-kernel/kernel/Documentation/_build/html/index.html
+