add doc page for bubble menu

docs/src/docPages/api/extensions/bubble-menu.md

@@ -0,0 +1,39 @@
+# Bubble Menu
+[![Version](https://img.shields.io/npm/v/@tiptap/extension-bubble-menu.svg?label=version)](https://www.npmjs.com/package/@tiptap/extension-bubble-menu)
+[![Downloads](https://img.shields.io/npm/dm/@tiptap/extension-bubble-menu.svg)](https://npmcharts.com/compare/@tiptap/extension-bubble-menu?minimal=true)
+
+This extension will make a contextual menu appear near a selection of text.
+
+## Installation
+```bash
+# with npm
+npm install @tiptap/extension-bubble-menu
+# with Yarn
+yarn add @tiptap/extension-bubble-menu
+```
+
+## Settings
+| Option       | Type          | Default   | Description |
+| ------------ | ------------- | --------- | ----------- |
+| element      | `HTMLElement` | `null`    |             |
+| keepInBounds | `Boolean`     | `true`    |             |
+
+## Source code
+[packages/extension-bubble-menu/](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-bubble-menu/)
+
+## Vanilla JavaScript
+```js
+import { Editor } from '@tiptap/core'
+import BubbleMenu from '@tiptap/extension-bubble-menu'
+
+new Editor({
+  extensions: [
+    BubbleMenu.configure({
+      element: document.querySelector('.menu'),
+    }),
+  ],
+})
+```
+
+## Vue
+<demo name="Extensions/BubbleMenu" />