Add FoalTS backend framework

[francelwebdev]

By submitting this pull request, I promise I have read the contribution guidelines twice and ensured my submission follows it. I realize not doing so wastes the maintainers' time that they could have spent making the world better. 🖖

⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆

[sindresorhus]

Thanks for the suggestion. I'm unfortunately going to pass on this one.