Add License info to files

Log.go

@@ -1,3 +1,5 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for details.
 package main
 
 import (

RandomAccessReader.go

@@ -1,3 +1,5 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for details.
 package main
 
 import (