add basic task list and task item extension

docs/src/docPages/api/extensions/task-list.md

@@ -0,0 +1,31 @@
+# TaskList
+This extension enables you to use task lists in the editor. They are rendered as `<ul>` HTML tags.
+
+## Installation
+::: warning Use with TaskItem
+The `TaskList` extension is intended to be used with the [`TaskItem`](/api/extensions/task-item) extension. Make sure to import that one too, otherwise you’ll get a SyntaxError.
+:::
+
+```bash
+# With npm
+npm install @tiptap/extension-task-list @tiptap/extension-task-item
+
+# Or: With Yarn
+yarn add @tiptap/extension-task-list @tiptap/extension-task-item
+```
+
+## Settings
+| Option | Type   | Default | Description                                  |
+| ------ | ------ | ------- | -------------------------------------------- |
+| class  | string | –       | Add a custom class to the rendered HTML tag. |
+
+## Commands
+| Command     | Options | Description           |
+| ----------- | ------- | --------------------- |
+| task_list | —       | Toggle a task list. |
+
+## Source code
+[packages/extension-task-list/](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-task-list/)
+
+## Usage
+<demo name="Extensions/TaskList" />