Add ReadTheDocs configuration/site in repo root directory

Issue-ID: NONRTRIC-864
Change-Id: I648b265d07b673eb0a186e78132169c1c541e9e7
Signed-off-by: JohnKeeney <john.keeney@est.tech>
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
new file mode 100644
index 0000000..ec7ae3e
--- /dev/null
+++ b/docs/requirements-docs.txt
@@ -0,0 +1,13 @@
+tox
+Sphinx
+doc8
+docutils
+setuptools
+six
+sphinx_rtd_theme
+sphinxcontrib-needs
+sphinxcontrib-swaggerdoc
+sphinx_bootstrap_theme
+sphinxcontrib-redoc
+lfdocs-conf
+sphinx-multiproject