add basic task list and task item extension

docs/src/demos/Extensions/TaskList/index.vue

@@ -0,0 +1,53 @@
+<template>
+  <div v-if="editor">
+    <button @click="editor.chain().focus().taskList().run()" :class="{ 'is-active': editor.isActive('task_list') }">
+      task list
+    </button>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor } from '@tiptap/core'
+import { EditorContent } from '@tiptap/vue'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import TaskList from '@tiptap/extension-task-list'
+import TaskItem from '@tiptap/extension-task-item'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        TaskList(),
+        TaskItem(),
+      ],
+      content: `
+        <ul data-type="task_list">
+          <li>A list item</li>
+          <li>And another one</li>
+        </ul>
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>