Added documentation

Change-Id: I4cb4c8c56642337899d0865c147b54df72b2c1fa
diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..5a1ebd7
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,5 @@
+sphinx
+sphinx_rtd_theme
+reno[sphinx]
+https://github.com/ypid/yaml4rst/archive/master.tar.gz
+https://github.com/debops/yaml2rst/archive/master.tar.gz
\ No newline at end of file