add missing owners file for android-nn-driver.

OWNERS was missing, add a file owners.

Test: not needed, but for upload check.

Change-Id: I373e954d70cdcf20551f3fef75788cdcf7c708a0
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..4797ae5
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,4 @@
+jessehall@google.com
+kevindubois@google.com
+linjoey@google.com
+spyffe@google.com