Update App.js to include the LoginForm.

frontend/src/App.js

@@ -1,22 +1,15 @@
 import logo from './logo.svg';
 import './App.css';
+import React from 'react';
+import LoginForm from './components/LoginForm';
 
 function App() {
   return (
     <div className="App">
       <header className="App-header">
         <img src={logo} className="App-logo" alt="logo" />
-        <p>
-          Edit <code>src/App.js</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
+        <h1>Welcome to NM3CLOL-admin</h1>
+        <LoginForm />
       </header>
     </div>
   );