The file's name is "readme.md". The dragonruby.exe file, when run, refers to it as "readme.txt".
The first line of the engine's itch.io page says "DragonRuby Game Toolkit is a professional grade (yet beginner friendly) 2D game engine.". Notice the words in parentheses.
I only mentioned other game engines to point out how little sense it makes to refer to the "programming world" in the context of game engines.
Look, this product has a 47.31 USD price tag on it (for my area at least) and has been marked as "released" for almost a year. It shouldn't be beyond the same criticism that any commercial piece of software would get.