[appserver-io*/*] Include a .editorconfing file to help enforce coding standards

[wick-ed]

There seems to be a way to enforce project based coding standards with editing IDEs by adding a .editorconfig fie containing the project's coding standards.
This might be evaluated, as it can further contributions from the community!

@see https://github.com/visualchefs/php-standards/blob/master/.editorconfig