Add docs building support

Signed-off-by: Roni Riska <roni.riska@nokia.com>
Change-Id: I288f12169f99665edc2a9ef71de1925766306738
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bdb4219
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.tox
+docs/_build/