doc: more doc, moooore

ReadMe.md

@@ -6,6 +6,38 @@
 
 ## folder structure
 
+### certificates
+
+Should only contain public certificates. Though i am thinking about making even
+them a secret with the future (r)age-nix setup
+
+### dev_shells
+
+Each dev-shell should have it's file or folder, even the default one
+
+### experiments
+
+The feel free folder, but don't go overboard, it should be temporary or interim stuff.
+
+### hosts
+
+Each host should have a folder with a default.nix in it. This file should import
+from system_profiles and can import specific things, but at some point just
+create a new system_profile. Especially when multiple hosts share imports
+
+### lib
+
+nix functions, that can be used around this repo. Please not on the outside
+
+### modules
+
+Most functionality is in here atm, not well defined yet.
+But basically just NixOS options
+
+### overlays
+
+nixpkgs overlay, right now only used for nixos-unstable
+
 ### system_profiles
 
 This whole folder is for the most part just a system to clean up importing