Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I33f691d071066c18cfb1194fcb50a8c0d41a77f9
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..022d37f
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,5 @@
+# Default code reviewers picked from top 3 or more developers.
+# Please update this list if you find better candidates.
+igorr@google.com
+ajchen@google.com
+# sriniv@google.com # not found in AOSP Gerrit yet