Add license and copyright information

Added licensing information and copyright notice to _cocoalayer.h

src/_cocoalayer.h

@@ -1,3 +1,27 @@
+/*
+*   _cocoalayer.h - A Cocoa Layer for raylib.
+*
+*   LICENSE: zlib/libpng
+*
+*   Copyright (c) 2025 Annes Widow (@annes12345678910)
+*
+*   This software is provided "as-is", without any express or implied warranty. In no event
+*   will the authors be held liable for any damages arising from the use of this software.
+*
+*   Permission is granted to anyone to use this software for any purpose, including commercial
+*   applications, and to alter it and redistribute it freely, subject to the following restrictions:
+*
+*     1. The origin of this software must not be misrepresented; you must not claim that you
+*     wrote the original software. If you use this software in a product, an acknowledgment
+*     in the product documentation would be appreciated but is not required.
+*
+*     2. Altered source versions must be plainly marked as such, and must not be misrepresented
+*     as being the original software.
+*
+*     3. This notice may not be removed or altered from any source distribution.
+*
+*/
+
 #ifdef __APPLE__
 
 #ifdef __cplusplus