feat: add networkmanager nixos module

modules/nixos/networking/networkmanager.nix

@@ -0,0 +1,32 @@
+{ config, lib, ... }:
+let
+  inherit (lib)
+    mkEnableOption
+    mkForce
+    mkIf
+    mkOption
+    ;
+  inherit (lib.types) listOf package;
+  cfg = config.ataraxia.networkmanager;
+in
+{
+  options.ataraxia.networkmanager = {
+    enable = mkEnableOption "Enable NetworkManager";
+    plugins = mkOption {
+      type = listOf package;
+      default = [ ];
+      description = ''
+        List of NetworkManager plug-ins to enable.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    networking.networkmanager.enable = mkForce true;
+    networking.networkmanager.plugins = mkForce cfg.plugins;
+
+    persist.state.directories = [
+      "/etc/NetworkManager/system-connections"
+    ];
+  };
+}