Add a .gitignore file.

This prevents .pyc files from appearing in "repo status".

BUG=None
TEST=git status

Change-Id: Idc3c6b0a02f28b926a056f09e3f57217e57472b0
Reviewed-on: https://chromium-review.googlesource.com/191128
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a922f4b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+# Generated files
+*.pyc