Migrate vnfsdk-model docs

Merging this will create
https://onap-vnfsdk-model.readthedocs.io
This build will run in parallel
to the current docs generation method
until we are ready to cut over.

Issue-ID: CIMAN-364
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: Ifd688016f586aed584a20ecf8690f4c6caaf039a
diff --git a/docs/tox.ini b/docs/tox.ini
new file mode 100644
index 0000000..edac8c3
--- /dev/null
+++ b/docs/tox.ini
@@ -0,0 +1,22 @@
+[tox]
+minversion = 1.6
+envlist = docs,
+skipsdist = true
+
+[testenv:docs]
+basepython = python3
+deps = -r{toxinidir}/requirements-docs.txt
+commands =
+    sphinx-build -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
+    echo "Generated docs available in {toxinidir}/_build/html"
+whitelist_externals =
+    echo
+    git
+    sh
+
+[testenv:docs-linkcheck]
+basepython = python3
+#deps = -r{toxinidir}/requirements-docs.txt
+commands = echo "Link Checking not enforced"
+#commands = sphinx-build -b linkcheck -d {envtmpdir}/doctrees ./ {toxinidir}/_build/linkcheck
+whitelist_externals = echo