Add documentation skeleton

Change-Id: I3d9438da7fdbb21f72ac6f2d5a5178b53711a27f
Signed-off-by: wrider <lji@research.att.com>
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
new file mode 100644
index 0000000..09a0c1c
--- /dev/null
+++ b/docs/requirements-docs.txt
@@ -0,0 +1,5 @@
+sphinx
+sphinx-rtd-theme
+sphinxcontrib-httpdomain
+recommonmark
+lfdocs-conf