docs: Add SphinxQuickstartTemplate.rst.

The intent of this document is to be the go-to document for anybody who
wants to write new documentation, but isn't familiar with Sphinx.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165775 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/userguides.rst b/docs/userguides.rst
index 6ff46ad..94f7218 100644
--- a/docs/userguides.rst
+++ b/docs/userguides.rst
@@ -18,6 +18,7 @@
    HowToAddABuilder
    yaml2obj
    HowToSubmitABug
+   SphinxQuickstartTemplate
 
 * :ref:`getting_started`
     
@@ -70,6 +71,10 @@
     
    Instructions for properly submitting information about any bugs you run into
    in the LLVM system.
+* :doc:`SphinxQuickstartTemplate`
+
+  A template + tutorial for writing new Sphinx documentation. It is meant
+  to be read in source form.
     
 * `LLVM Testing Infrastructure Guide <TestingGuide.html>`_