added virtualisation file

virtualisation-configuration.nix

@@ -0,0 +1,22 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = with pkgs; [
+    docker-compose
+  ];
+
+  virtualisation = {
+    podman = {
+      enable = true;
+      defaultNetwork.settings.dns_enabled = true;
+    };
+
+    docker = {
+      enable = true;
+      rootless = {
+        enable = true;
+        setSocketVariable = true;      
+      };
+    };
+  };
+  users.extraGroups.docker.members = [ "caleb" ];
+}