protocols: printer: add short license to top of existing files

Signed-off-by: Kris Bahnsen <Kris@KBEmbedded.com>

protocols/printer/include/printer_proto.h

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2024 KBEmbedded
+
 #ifndef PRINTER_PROTO_H
 #define PRINTER_PROTO_H
 

protocols/printer/include/printer_receive.h

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2024 KBEmbedded
+
 #ifndef PRINTER_RECEIVE_H
 #define PRINTER_RECEIVE_H
 

protocols/printer/printer_i.h

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2024 KBEmbedded
+
 #ifndef PRINTER_I_H
 #define PRINTER_I_H
 

protocols/printer/printer_proto.c

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2024 KBEmbedded
+
 #include <furi.h>
 
 #include <gblink/include/gblink.h>

protocols/printer/printer_receive.c

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2024 KBEmbedded
+
 #include <stdint.h>
 
 #include <furi.h>