Add support for ONAP documentation project

Provided the mandatory doc structure:
  docs/
    index.rst
    ...

Added a couple of .gitignore for better testing and development.

Change-Id: I722806681e4844e0ea915006bc7de6018d3073d7
Issue-ID: OOM-1672
Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
diff --git a/docs/.gitignore b/docs/.gitignore
new file mode 100644
index 0000000..19fe1aa
--- /dev/null
+++ b/docs/.gitignore
@@ -0,0 +1,2 @@
+conf.py*
+_static