add basic vue setup example

docs/src/demos/VueSetup/index.vue

@@ -0,0 +1,33 @@
+<template>
+  <editor-content :editor="editor" />
+</template>
+
+<script>
+import { Editor } from '@tiptap/core'
+import { EditorContent, Renderer } from '@tiptap/vue'
+import extensions from '@tiptap/starter-kit'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      content: '<p>I’m running tiptap with Vue.js. This demo is interactive, try to edit the text.</p>',
+      extensions: extensions(),
+      renderer: Renderer,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>

docs/src/demos/VueSetup/style.scss

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+.this-is-a-test {
+  color: black;
+}