add steam module

sadly this has to be a system package until we find a non shitty way of
installing in through hm

nixos/default.nix

@@ -1 +1,10 @@
-{}
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  imports = [
+    ./steam.nix
+  ];
+}

nixos/steam.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.local.sys.steam;
+in {
+  options.local.sys.steam = {
+    enable = mkEnableOption "steam settings";
+  };
+  config = mkIf cfg.enable {
+    programs.steam = {
+      enable = true;
+      remotePlay.openFirewall = true;
+      dedicatedServer.openFirewall = true;
+      localNetworkGameTransfers.openFirewall = true;
+    };
+
+    environment = {
+      systemPackages = with pkgs; [
+        protontricks
+        protonup
+        protonup-ng
+        winetricks
+      ];
+    };
+  };
+}