MAPG-86 add 404 error page

views/error/404.php

@@ -0,0 +1,7 @@
+<?php require ROOT . '/views/templates/main_header.php'; ?>
+<?php require ROOT . '/views/templates/header.php'; ?>
+<div class="main">
+    <h2>404 | Page not found</h2>
+    <p>The requested URL was not found on this server. <a href="/" title="MapGuesser">Back to start.</a></p>
+</div>
+<?php require ROOT . '/views/templates/main_footer.php'; ?>

views/templates/header.php

@@ -0,0 +1,8 @@
+<div class="header">
+    <h1>
+        <a href="/" title="MapGuesser">
+            <?php require ROOT . '/views/templates/icon.php'; ?>
+            MapGuesser
+        </a>
+    </h1>
+</div>