Added Login + Register Frontend and Authorization

public/login.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Login</title>
+  <link rel="stylesheet" href="styles.css">
+</head>
+<body>
+<form method="post" action="/login">
+  <input type="text" name="username" placeholder="Username">
+  <input type="password" name="password" placeholder="Password">
+  <button type="submit">Login</button>
+</form>
+</body>
+<script src="frontend.js"></script>
+</html>