Add docs building support

Change-Id: I3415c0a1d3544fd64e4892b1f84f83739b35df7c
Signed-off-by: Roni Riska <roni.riska@nokia.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bdb4219
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.tox
+docs/_build/