Add transmission

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/gui/transmission/default.nix

@@ -0,0 +1,17 @@
+{
+  user ? throw "user argument is required",
+  home ? throw "home argument is required",
+}:
+{ pkgs, ... }:
+{
+  home-manager.users.${user} = {
+    home.packages = with pkgs; [ transmission_4-gtk ];
+
+    xdg.configFile."transmission/settings.json".source =
+      (pkgs.formats.json { }).generate "settings.json"
+        {
+          user-has-given-informed-consent = true;
+          torrent-complete-sound-enabled = false;
+        };
+  };
+}