Added password lock to ticket system

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

index.html

@@ -12,7 +12,7 @@
                 <h2>CSG Ticketsystem</h2>
                 <img src="./img/csg.png" width="100"/>
             </div>
-            <form action="" method="post">
+            <form action="./php/unlock.php" method="post">
                 <input type="password" name="password" id="password" placeholder="Passwort" required/>
                 <button type="submit">Login</button>
             </form>