chore: Add MIT license headers to source files

Add SPDX license identifiers and copyright notices to:
- include/ofd/ofd_reader.h
- include/ofd/ofd_writer.h
- src/ofd_reader.cpp
- src/ofd_writer.cpp

Using standard SPDX format to clearly indicate:
- Copyright holder: CodingEagle2025
- Copyright year: 2025
- License: MIT

Author: CodingEagle2025

examples/simple_example.cpp

@@ -1,3 +1,8 @@
+// Copyright (C) 2025, CodingEagle2025
+// SPDX-FileCopyrightText: 2025 
+//
+// SPDX-License-Identifier: MIT
+
 #include <ofd/ofd_reader.h>
 #include <ofd/ofd_writer.h>
 #include <QApplication>

include/ofd/ofd_reader.h

@@ -1,3 +1,8 @@
+// Copyright (C) 2025, CodingEagle2025
+// SPDX-FileCopyrightText: 2025 
+//
+// SPDX-License-Identifier: MIT
+
 #ifndef OFD_READER_H
 #define OFD_READER_H
 

include/ofd/ofd_writer.h

@@ -1,3 +1,8 @@
+// Copyright (C) 2025, CodingEagle2025
+// SPDX-FileCopyrightText: 2025 
+//
+// SPDX-License-Identifier: MIT
+
 #ifndef OFD_WRITER_H
 #define OFD_WRITER_H
 

src/ofd_reader.cpp

@@ -1,3 +1,8 @@
+// Copyright (C) 2025, CodingEagle2025
+// SPDX-FileCopyrightText: 2025 
+//
+// SPDX-License-Identifier: MIT
+
 #include "ofd/ofd_reader.h"
 #include <QDir>
 #include <QFile>

src/ofd_writer.cpp

@@ -1,3 +1,8 @@
+// Copyright (C) 2025, CodingEagle2025
+// SPDX-FileCopyrightText: 2025 
+//
+// SPDX-License-Identifier: MIT
+
 #include "ofd/ofd_writer.h"
 #include <QDir>
 #include <QFile>