Add license header.

Author: Diptorup Deb

numba_dpex/core/runtime/_queuestruct.h

@@ -1,10 +1,15 @@
-#ifndef NUMBA_DPEX_QUEUESTRUCT_H_
-#define NUMBA_DPEX_QUEUESTRUCT_H_
-/*
- * Fill in the *queuestruct* with information from the Numpy array *obj*.
- * *queuestruct*'s layout is defined in numba.targets.arrayobj (look
- * for the ArrayTemplate class).
- */
+// SPDX-FileCopyrightText: 2020 - 2023 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Defines the numba-dpex native representation for a dpctl.SyclQueue
+///
+//===----------------------------------------------------------------------===//
+
+#pragma once
 
 #include <Python.h>
 
@@ -13,5 +18,3 @@ typedef struct
     PyObject *parent;
     void *queue_ref;
 } queuestruct_t;
-
-#endif /* NUMBA_DPEX_QUEUESTRUCT_H_ */