[owners] Add OWNERs files to openweave-core

Bug:78497
Change-Id: I7f2883065eaad7af4c11d169ba27c13dadf22c9e
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..2f538b2
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,3 @@
+vaas@google.com
+prashanthsw@google.com
+sundarsrini@google.com