CGL-Documentation - Add a notice about byte order mark
In the PHP and JS CGL there is mentioned that all files must be UTF-8 encoded:
Files must be encoded in UTF-8
Afaik UTF-8 can ship with byte order mark or without.
In PSR-1 there is a notice about the BOM in UTF-8 files (https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-1-basic-coding-standard.md).
In some cases the BOM creates some wired problems in PHP.
I think we should add a small notice about the BOM :)