Add top level OWNERS for cts/ project

This is the backup owner list in case test module doesn't have
owners specified.

BUG: 148984657

Change-Id: I1eacb58882a22872310b3b2a01132b889083db29
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..80258c3
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,20 @@
+# This is a list of backup approvers.
+# Each test should have their own OWNERS file specified
+# in sub-directory. And changes to specific test code
+# should be approved by test owners.
+
+# Ordered by escalation priority
+# Android Partner Eng Approvers
+rossyeh@google.com
+robinjacob@google.com
+mariay@google.com
+aaronholden@google.com
+yuji@google.com
+nickrose@google.com
+
+# Android EngProd Approvers
+fdeng@google.com
+normancheung@google.com
+moonk@google.com
+guangzhu@google.com
+jdesprez@google.com