chore(examples): add sapper set-up

examples/sapper/src/routes/_layout.svelte

@@ -0,0 +1,32 @@
+<script>
+  export let segment = undefined;
+
+  import {
+    Content,
+    Breadcrumb,
+    BreadcrumbItem,
+    Grid,
+    Row,
+    Column,
+    Tabs,
+    TabContent,
+    Tab,
+    Select,
+    SelectItem,
+  } from "carbon-components-svelte";
+  import Header from "../components/Header.svelte";
+  import Theme from "../components/Theme.svelte";
+</script>
+
+<style lang="scss" global>
+  @import "carbon-components-svelte/css/all";
+</style>
+
+<Theme persist theme="g10">
+  <Header segment="{segment}" />
+  <Content style="background: none; padding: 1rem">
+    <Grid>
+      <slot />
+    </Grid>
+  </Content>
+</Theme>