Added copyright information

Zephyr/src/main.c

@@ -1,3 +1,7 @@
+// Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+// Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #include <zephyr/kernel.h>
 #include <zephyr/sys/printk.h>