Add proper license to raylib-parser

parser/LICENSE

@@ -0,0 +1,16 @@
+Copyright (c) 2021 Ramon Santamaria (@raysan5)
+
+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.

parser/README.md

@@ -59,7 +59,5 @@ This parser **does not require `<string.h>` library**, all data is parsed direct
 
 ### LICENSE: zlib/libpng
 
-raylib-parser is licensed under an unmodified zlib/libpng license, which is an OSI-certified,
-BSD-like license that allows static linking with closed source software:
+raylib-parser is licensed under an unmodified zlib/libpng license, which is an OSI-certified, BSD-like license that allows static linking with closed source software. Check [LICENSE](LICENSE) for further details.
 
-Copyright (c) 2021 Ramon Santamaria (@raysan5)