README.md

Big fucking thanks to this absolute legend for being the only reason I didn't give up on this thing the second I ran my first compile (and got fifty linker errors).

Also big shoutout to the DOOM source code on github and the Game Engine Black Book on DOOM

And I cannot forget this chad for making a (at the time of writing this) very simple C++ & OpenGL game engine (just like I'm trying to do!). I referenced his repo just as often, if not more than the Quake and DOOM repos.