feat: add sample multi-user support

feat: update README

client/src/components/Nav/Logout.jsx

@@ -0,0 +1,23 @@
+import React, { useState, useContext } from 'react';
+import { useSelector } from 'react-redux';
+import LogOutIcon from '../svg/LogOutIcon';
+
+
+export default function Logout() {
+  const { user } = useSelector((state) => state.user);
+  
+  const clickHandler = () => {
+    window.location.href = "/auth/logout";
+  };
+
+  return (
+    <a
+      className="flex cursor-pointer items-center gap-3 rounded-md py-3 px-3 text-sm text-white transition-colors duration-200 hover:bg-gray-500/10"
+      onClick={clickHandler}
+    >
+      <LogOutIcon />
+      {user?.display || user?.username || 'USER'}
+      <small>Log out</small>
+    </a>
+  );
+}