added lxmd -p to reticulum making it a propagation node

reticulum.nix

@@ -1,7 +1,10 @@
 { config, pkgs, lib, ... }:
 
 {
-  environment.systemPackages = [ pkgs.python3Packages.rns ];
+  environment.systemPackages = [
+    pkgs.python3Packages.rns
+    pkgs.python3Packages.lxmf
+  ];
 
   environment.etc."reticulum-config".text = ''
     [reticulum]
@@ -49,5 +52,21 @@
     };
   };
 
+  systemd.services.lxmd = {
+    description = "LXMF Propagation Node daemon";
+    wantedBy = [ "multi-user.target" ];
+    after = [ "network.target" "rnsd.service" ];
+    requires = [ "rnsd.service" ];
+    serviceConfig = {
+      Type = "simple";
+      User = "reticulum";
+      ExecStart = "${pkgs.python3Packages.lxmf}/bin/lxmd -p";
+      Restart = "on-failure";
+      RestartSec = "5s";
+      Environment = "HOME=/var/lib/reticulum";
+      StateDirectory = "reticulum";
+    };
+  };
+
   networking.firewall.allowedTCPPorts = [ 25515 ];
 }