Greetd: Add a greeter

Modules/Greetd/assets/dms-niri.kdl

@@ -0,0 +1,21 @@
+hotkey-overlay {
+    skip-at-startup
+}
+
+environment {
+    DMS_RUN_GREETER "1"
+    QT_QPA_PLATFORM "wayland"
+    QT_WAYLAND_DISABLE_WINDOWDECORATION "1"
+}
+
+spawn-at-startup "sh" "-c" "qs -p _DMS_PATH_; niri msg action quit --skip-confirmation"
+
+debug {
+  keep-max-bpc-unchanged
+}
+
+gestures {
+   hot-corners {
+     off
+   }
+}