Restructure repo

modules/nixos/docker.nix

@@ -0,0 +1,6 @@
+# Docker is a containerization platform that allows you to run applications in isolated environments called containers.
+{ config, ... }:
+{
+  virtualisation.docker.enable = true;
+  users.users."${config.var.username}".extraGroups = [ "docker" ];
+}