Add license headers and LICENSE file
Change-Id: I6f7c7374093c0745ee4aa677480376a06648b358
diff --git a/singleton_ctx.go b/singleton_ctx.go
index ac97480..1426ff9 100644
--- a/singleton_ctx.go
+++ b/singleton_ctx.go
@@ -1,3 +1,17 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
package blueprint
import (