Add gitignore file

Change-Id: If0516bc7f8b1348a88e8b6d59dbd0d3353942503
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..57872d0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/vendor/