Add "Atomic" DateTime class

[BenRutlandWeb]

Laravel includes Carbon as a dependency for date/time manipulation for model created_at properties as an example, or for CRON scheduling.

Include Atomic a basic version of Carbon to allow for better date/time handling.

@see https://gist.github.com/BenRutlandWeb/a70f241e8bae2c619ee699f349430746