Create error template

src/templates/error.php

@@ -0,0 +1,15 @@
+<!-- https://github.com/DenverCoder1/readme-typing-svg/ -->
+<svg xmlns='http://www.w3.org/2000/svg'
+	xmlns:xlink='http://www.w3.org/1999/xlink'
+	viewBox='0 0 400 50'
+	width='400px' height='50px'>
+
+	<style>
+		@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono');
+	</style>
+
+    <text font-family='"JetBrains Mono", monospace' fill='#c00' font-size='18'
+        y="50%" x='50%' dominant-baseline='middle' text-anchor='middle'>
+        <?php echo $message . "\n" ?>
+    </text>
+</svg>