tdl#3++ improve the readme

[KayosMaker]

id like to go over the readme again, and add some info to answer questions we are seeing a lot on the discord. it may be worthwhile to add a readme to some of the subfolders, to help explain their contents without bloating the main readme too much. we dont need to write a manual, but could do a bit better with helping guide people on what it takes to doom up.