Add license information to files in examples

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

examples/host.yml

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2022 MDAD project contributors
+# SPDX-FileCopyrightText: 2024 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 # This is a host file for usage with the `../bin/ansible-all-hosts.sh` script,