Never wrote a readme file, didn't think I needed to make one.
1. Ignore the "beta_unreleased_maps_made_by_me" and goto the "crazycubes" folder
2. extract the garrysmod folder to the default location if you're using windows and your c drive:
"C:\Program Files\Steam\steamapps\<user>\garrysmod"
Optional: just put the .bsp file in the maps folder under the 2nd garrysmod folder

It's very simple guys, just a .bsp file, use google if you need more halp