Created base component for MenuGroup and MenuItem

src/renderer/components/MenuGroup.vue

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+<template>
+    <div>
+        MenuGroup
+    </div>
+</template>
+
+<script>
+export default {
+  name: 'MenuGroup'
+}
+</script>
+
+<style>
+
+</style>

src/renderer/components/MenuItem.vue

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+<template>
+    <div>
+        Item
+    </div>
+</template>
+
+<script>
+export default {
+  name: 'MenuItem'
+}
+</script>
+
+<style>
+
+</style>