ignore various files

BUG=b:20895978

Change-Id: Ifbf8da40766ed3a6207f2e266cfd90cd6502d2be
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..539da74
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.py[co]