Add MOROS

[vinc]

Hi, I'd like to add MOROS to the list!

It's a hobby OS I've been working on and off for the past 2 years, it's inspired by Unix but it definitely won't be big and professional! The goal is to have a clean and simple text environment to have fun with computers from the 2005 to 2020 era.

Currently there's a limited userspace capable of running simple nasm programs (one at a time!) with some syscalls, but most programs (a shell, an editor, a lisp, a chess game, a 2048 game...) are running from kernelspace. It also has it's own simple filesystem and a network stack.

https://github.com/vinc/moros/blob/trunk/doc/index.md