include the necessary imports

as suggested in #75

Author: thomas725

docs/src/routes/docs/[...1]getting-started/[...3]quick-start.md

@@ -142,6 +142,9 @@ Explore this example in the [REPL](https://svelte.dev/repl/08cb356f4fad4c03ae331
 <!-- prettier-ignore -->
 ```svelte
 <script>
+  import {createTable, Subscribe, Render} from 'svelte-headless-table';
+  import { readable } from "svelte/store";
+
   const data = readable([
     { name: 'Ada Lovelace', age: 21 },
     { name: 'Barbara Liskov', age: 52 },