Add ui scaffolding

ui/src/App.svelte

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+<script>
+	export let name;
+</script>
+
+<style>
+	h1 {
+		color: purple;
+	}
+</style>
+
+<h1>Hello {name}!</h1>

ui/src/main.js

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+import App from './App.svelte';
+
+const app = new App({
+	target: document.body,
+	props: {
+		name: 'Wireguard'
+	}
+});
+
+export default app;