Add default active developers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I31a38cc83fe747bcce0eb40d9ce6a07c0e01ba31
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..32bf1c3
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+iam@google.com