add gnome3

modules/gnome.nix

@@ -0,0 +1,52 @@
+{ config, pkgs, ... }: {
+  environment.systemPackages = with pkgs; [
+    celluloid
+    gnome.gnome-boxes
+    gnome.gnome-tweaks
+    nextcloud-client
+  ];
+
+  environment.gnome.excludePackages = with pkgs; [
+    gnome.totem
+    gnome.geary
+
+    gnome-console
+    epiphany
+  ];
+
+
+  services.gnome = {
+    evolution-data-server.enable = true;
+    gnome-keyring.enable = true;
+    gnome-online-accounts.enable = true;
+    games.enable = true;
+  };
+
+  programs = {
+    seahorse.enable = true;
+
+  evolution = {
+    enable = true;
+    plugins = [ pkgs.evolution-ews ];
+  };
+
+  gnome-terminal.enable = true;
+  };
+
+  qt5 = {
+    enable = true;
+    platformTheme = "gnome";
+    style = "adwaita-dark";
+  };
+
+  programs.gnupg.agent.pinentryFlavor = "gnome3";
+
+  services.xserver = {
+    enable = true;
+    desktopManager.gnome.enable = true;
+    displayManager.gdm = {
+      enable = true;
+      wayland = true;
+    };
+  };
+}