Added password lock to ticket system

Created php file to redirect to the ticket submit page when entering
right password

php/unlock.php

@@ -0,0 +1,19 @@
+<?php
+session_start();
+
+$pass = "test123";
+$try = $_POST['password'] ?? '';
+$unlocked = false;
+
+if ($pass === $try) {
+    $unlocked = true;
+}
+
+if ($unlocked) {
+    $_SESSION['unlocked'] = true;
+    header("Location: ./ticket_lock.php");
+    exit;
+} else {
+    header("Location: ../index.html?error=1");
+    exit;
+}