added system to dirs

modules/system/docker/default.nix

@@ -0,0 +1,19 @@
+{ pkgs, config, lib, ... }:
+
+let
+  cfg = config.system.docker;
+in
+{
+  options.system.docker = {
+    enable = lib.mkEnableOption "enables docker";
+  };
+
+  config = lib.mkIf cfg.enable {
+    virtualisation.docker = {
+      enable = true;
+      daemon.settings = {
+        experimental = true;
+      };
+    };
+  };
+}