Add placeholder for Victoria specs

Change-Id: I7c0c416013afeecc31cd9b9d51d3016c79c72269

doc/source/index.rst

@@ -10,6 +10,7 @@ Specifications and RFEs
 .. toctree::
    :maxdepth: 2
 
+   specs/victoria/index
    specs/ussuri/index
    specs/train/index
    specs/stein/index

specs/victoria/index.rst

@@ -0,0 +1,9 @@
+========
+Victoria
+========
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   *

specs/victoria/placeholder.rst

@@ -0,0 +1,31 @@
+..
+   This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+==================
+(Placeholder Spec)
+==================
+
+This file is just a placeholder for the specs directory.
+It will be removed soon after some spec is merged.
+
+The latest spec template is found at ``specs/template.rst``
+in the ``neutron-specs`` repository.
+
+Problem Description
+===================
+
+Sphinx toctree complains if no file exists in a directory
+specified in toctree glob.
+
+Proposed Change
+===============
+
+Add this file.
+
+References
+==========
+
+None.