add examples

src/FitComp.svelte

@@ -1,12 +1,15 @@
 <script>
   import { useSvelteFlow } from "@xyflow/svelte";
-	import {nodes, auto} from './stores.js';
+  import { nodes, auto, doFit } from "./stores.js";
 
   const { zoomIn, zoomOut, setZoom, fitView, setCenter, setViewport, getViewport, viewport } =
     useSvelteFlow();
 
-	nodes.subscribe((n) => {
-		if ($auto) fitView();
-	});
-</script>
+  nodes.subscribe((n) => {
+    if ($auto) fitView();
+  });
 
+  doFit.subscribe(() => {
+    fitView();
+  });
+</script>