refactor: coding standards LINE ENDINGS missmatch

[hanoii]

Follow up to #80

I noticed something else, all files have CRLF, PSR-12 also states that all files should end in Unix style LF:

https://www.php-fig.org/psr/psr-12/#22-files

All PHP files MUST use the Unix LF (linefeed) line ending only.
All PHP files MUST end with a non-blank line, terminated with a single LF.

I would also add a .gitattributes file to enforce this.

Something like :

# Default: all detected text files use LF in the repo and in checkouts
* text=auto eol=lf

# Keep Windows-native scripts CRLF if you actually need them that way (optional)
# *.bat text eol=crlf
# *.cmd text eol=crlf
# *.ps1 text eol=crlf

LF is the pretty much the ubiquitous line ending. I assume you are on windows but it can still be used this way and you can play with git core.autocrlf setting.