Ignore the built artifacts

Change-Id: I4370dc85c35005f09de46b1b5c6ce3857934f9de
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..45ddf0a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+site/