add a .gitignore file to make git ignore *.pyc files

Change-Id: Ie8877ca9c1152681433a638a5e4d20948326f7ca
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d20b64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc