Please add vityafx/dotenv

[iddm]

Project link: https://github.com/vityafx/dotenv
Project name: dotenv (can be changed to fx-dotenv to avoid confusion with the current cl-dotenv package).
Project license: MIT

I am the author of this package, it provides a very simple yet convenient library to parse and obtain .env-file(s) values.

P.S.
I am a first-time contributor to quicklisp, this is my first package published here.