add dms-plugin-dev agent skill for plugin development (#2394)

.agents/skills/dms-plugin-dev/assets/templates/widget/Settings.qml

@@ -0,0 +1,23 @@
+import QtQuick
+import qs.Common
+import qs.Widgets
+import qs.Modules.Plugins
+
+PluginSettings {
+    pluginId: "myWidget"
+
+    StringSetting {
+        settingKey: "text"
+        label: "Display Text"
+        description: "Text shown in the bar widget"
+        placeholder: "Hello"
+        defaultValue: "Hello"
+    }
+
+    ToggleSetting {
+        settingKey: "showIcon"
+        label: "Show Icon"
+        description: "Display an icon next to the text"
+        defaultValue: true
+    }
+}