add markdown shortcuts demo

examples/Components/Routes/MarkdownShortcuts/index.vue

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+<template>
+	<div>
+		<editor :editable="true" class="editor" @update="onUpdate">
+
+			<div class="editor__content" slot="content" slot-scope="props">
+        <h1>
+          Markdown Shortcuts
+        </h1>
+        <p>
+					Start a new line and type <code>"#"</code> followed by a space and you will get an H1 headline. 🤯
+				</p>
+        <p>
+          This feature is called <strong>input rules</strong>. There are some of these shortcuts for the most basic nodes available by default. Try <code>"#, ##, ###, …"</code> for headlines, <code>">"</code> for blockquotes, <code>"- or +"</code> for bullet lists. And of course you can add your own input rules.
+        </p>
+      </div>
+
+		</editor>
+	</div>
+</template>
+
+<script>
+import Icon from 'Components/Icon'
+import { Editor } from 'tiptap'
+
+export default {
+  components: {
+    Editor,
+    Icon,
+  },
+  methods: {
+    onUpdate(state) {
+      console.log(state.doc.toJSON())
+    },
+  },
+}
+</script>