added error page

Author: basicavisual

src/routes/+error.svelte

@@ -0,0 +1,10 @@
+<script>
+  import { page } from '$app/stores';
+</script>
+
+<div class="container mx-auto py-20">
+  <div class="w-1/2 p-20 mx-auto w-1/2 mx-auto bg-[url('/grid-bg.png')] bg-cmxyellow text-center" style={`box-shadow: 7px 7px 1px black;`}>
+    <h1 class="text-5xl font-bold">Error {$page.status}</h1>
+    <p class="text-lg">{$page.error.message}</p>
+  </div>
+</div>