Add php-cs-fixer and config for coding standards

[parijke]

Since this would be a learning experience for (many?) developers, good coding standards are mandatory to ensure code quality and readability accros PR's

[GaryClarke]

Not a bad idea Paul. I'll look at adding codesniffer setup for psr12 at some point...or feel free to add it yourself.

[parijke]

Will look into it this weekend

[mobeendev]

@GaryClarke also create a separate video on how to setup code sniffer for PHP projects.
TIA.