Add dialog.js

dialog.js.md

@@ -0,0 +1,17 @@
+```javascript
+import { dialog, factory, UserDialog } from './dialog.js';
+```
+
+## dialog.TYPE(message, ?title, ?actions, ?options) → Promise
+
+The `dialog` class is a proxy around `factory.showDialog` that saves a few characters. The type can be any string, and styling can be applied using the `-style-TYPE` class.
+
+## factory.showDialog(type, message, title, actions, options) → Promise
+
+Create and show a new dialog. The type can be any string, and styling can be applied using the `-style-TYPE` class.
+
+## class UserDialog
+
+### constructor(style, title, message, actions, options)
+
+### show() → Promise