完成前后端框架搭建，完成聊天页面布局

web/src/views/404.vue

@@ -0,0 +1,17 @@
+<template>
+  <div>{{ title }}</div>
+</template>
+
+<script>
+import { defineComponent } from "vue"
+
+export default defineComponent({
+  name: 'NotFound',
+  data () {
+    return {
+      title: "404 Page",
+
+    }
+  },
+})
+</script>