Add getting help landing page

doc/user_guide/getting_help.rst

@@ -0,0 +1,28 @@
+Getting Help
+============
+
+Altair is BSD-licensed and the source is available on `GitHub`_,
+where you can also report `bugs and feature requests`_.
+For general questions, please ask on `StackOverflow`_
+using the `altair` tag.
+
+You can browse this documentation
+via the links in the top navigation panel
+or by viewing the full site :ref:`genindex`.
+In addition to reading this documentation page,
+it can be helpful to also browse the `Vega-Lite documentation <https://vega.github.io/vega-lite/docs/>`_.
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Getting Help
+   :hidden:
+
+   faq
+   troubleshooting
+
+.. _GitHub: http://github.com/altair-viz/altair
+.. _Git Issues: http://github.com/altair-viz/altair/issues
+.. _Vega: http://vega.github.io/vega
+.. _Vega-Lite: http://vega.github.io/vega-lite
+.. _bugs and feature requests: https://github.com/altair-viz/altair/issues/new/choose
+.. _StackOverflow: https://stackoverflow.com/tags/altair