Initial commit of Sphinx docs

Change-Id: I9fca8fb98502dffc2555f9de7f507b6f006e0e77
Signed-off-by: John DeNisco <jdenisco@cisco.com>
diff --git a/docs/reference/cmdreference/interface/index.rst b/docs/reference/cmdreference/interface/index.rst
new file mode 100644
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+.. _interfacecommands:
+
+Interface Commands
+==================
+
+.. toctree::
+
+   hardware
+   interface
+   subinterface