Documentation has always been part of the coding, not an afterthought, not an optional thing, not a second-class citizen. This is how I was taught in university. I'm still baffled to see how many developers believe the key to professional success is writing a lot of computer code, as fast and as efficiently as possible. Then you go to their GitHub repos for their personal projects and they're completely unusable because you don't even get installation instructions. Best case scenario you will get an auto-install script that works on Debian 9 and has been unmaintained for years, but at least you can read what it's doing and adapt it to your distribution of choice.
Complete insanity.