ref: adding copyright headers and licensing files

Change-Id: I135f73159c3e010f7faf14f1215bbd74eb32c2cb
diff --git a/services/mgmt/device/doc.go b/services/mgmt/device/doc.go
index f996f73..99285d5 100644
--- a/services/mgmt/device/doc.go
+++ b/services/mgmt/device/doc.go
@@ -1,3 +1,7 @@
+// Copyright 2015 The Vanadium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 // Package device contains the implementation for the v.io/v23//mgmt/device APIs.
 //
 // The device manager is a server that is expected to run on every