Added error page

src/routes/+error.svelte

@@ -0,0 +1,12 @@
+<script>
+  import { page } from "$app/stores";
+  import { Alert } from "flowbite-svelte";
+  import { ExclamationCircleSolid } from "flowbite-svelte-icons";
+</script>
+
+<div class="p-8">
+  <Alert color="red">
+		{#snippet icon()}<ExclamationCircleSolid class="h-5 w-5"/>{/snippet}
+    {$page.error.message}
+  </Alert>
+</div>