Add some modules for game hosting

modules/teeworlds.nix

@@ -0,0 +1,24 @@
+{ config, lib, ... }:
+
+{
+  options = {
+    chvp.teeworlds.enable = lib.mkOption {
+      default = false;
+      example = true;
+    };
+  };
+
+  config = lib.mkIf config.chvp.teeworlds.enable {
+    services.teeworlds = {
+      enable = true;
+      openPorts = true;
+      extraOptions = [
+        "sv_gametype ctf"
+        "sv_maprotation ctf1 ctf2 ctf3 ctf4 ctf5 ctf6 ctf7 ctf8"
+        "sv_map ctf1"
+        "sv_scorelimit 250"
+        "sv_teamdamage 1"
+      ];
+    };
+  };
+}