Update README.md with project setup, development instructions, environment variables, and build process for Svelte 5 and SvelteKit integration.

src/routes/+layout.svelte

@@ -0,0 +1,12 @@
+<script lang="ts">
+	import favicon from '$lib/assets/favicon.svg';
+	import './layout.css';
+
+	let { children } = $props();
+</script>
+
+<svelte:head>
+	<link rel="icon" href={favicon} />
+</svelte:head>
+
+{@render children()}