docs(palimpsest): add initial set-up

Supports #100

palimpsest/src/App.svelte

@@ -0,0 +1,50 @@
+<script>
+  import { Router, Link, Route } from 'svelte-routing';
+  import copy from 'clipboard-copy';
+  import { Search, Link as CarbonLink, CodeSnippet } from 'carbon-components-svelte';
+  import ThemePicker from './components/ThemePicker.svelte';
+
+  let value = '';
+
+  $: code = `
+    search component "${value}"
+  `.trim();
+</script>
+
+<style>
+  header {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    height: 2.5rem;
+    padding: 0 1rem;
+  }
+</style>
+
+<Router>
+  <nav>
+    <Link to="/">Home</Link>
+    <Link to="about">About</Link>
+  </nav>
+  <div>
+    <Route path="about" component={ThemePicker} />
+    <Route path="/">Home</Route>
+  </div>
+</Router>
+
+<header>
+  <CarbonLink href="https://github.com/IBM/carbon-components-svelte">GitHub</CarbonLink>
+  <div>
+    <ThemePicker />
+  </div>
+</header>
+
+<div style="width: 16rem">
+  <Search id="search-components" labelText="Components" small bind:value />
+</div>
+
+<CodeSnippet
+  on:click={() => {
+    copy(code);
+  }}
+  {code} />