feat: add LocalStorage component

docs/src/pages/framed/LocalStorage/LocalStorage.svelte

@@ -0,0 +1,29 @@
+<script>
+  import { LocalStorage, Toggle, Button } from "carbon-components-svelte";
+
+  let storage;
+  let toggled = false;
+  let events = [];
+
+  $: document.documentElement.setAttribute("theme", toggled ? "g100" : "white");
+</script>
+
+<LocalStorage
+  bind:this="{storage}"
+  key="dark-mode"
+  bind:value="{toggled}"
+  on:save="{() => {
+    events = [...events, { event: 'on:save' }];
+  }}"
+  on:update="{({ detail }) => {
+    events = [...events, { event: 'on:update', detail }];
+  }}"
+/>
+
+<Toggle size="sm" labelText="Dark mode" bind:toggled />
+
+<br />
+
+<pre>
+  {JSON.stringify(events, null, 2)}
+</pre>