prepared folderstructure for monorepo with express.js

apps/client/src/app/index.tsx

@@ -0,0 +1,10 @@
+import React from "react";
+import Chat from "./Chat";
+import Calender from "./Calender";
+
+export default function Index() {
+  return (
+    // <Chat />
+    <Calender />
+  );
+}