docs: Add examples

docs/src/examples/save.md

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+---
+pageClass: examples
+
+---
+
+# Save & Restore
+
+::: warning BREAKING CHANGE
+__Changes from 0.3.x to 0.4.x__
+The "built-in" storage feature has been fully removed.
+:::
+
+Storing nodes and loading is easy to handle. 
+This example demonstrates a save & restore functionality using the `LocalStorage` of the browser.
+You are of course free to implement your own logic (for example fetching the data from an API that's connected to a database).
+
+<div class="mt-6">
+  <iframe src="https://codesandbox.io/embed/vue-flow-save-restore-example-1u7u6t?eslint=1&fontsize=14&hidenavigation=1&module=%2Fsrc%2Fcomponents%2FFlow.vue&theme=dark"
+    class="hidden dark:block bg-black h-full w-full min-h-[75vh]"
+    title="Vue Flow: Save & Restore Example"
+    allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
+    sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
+  ></iframe>
+  <iframe src="https://codesandbox.io/embed/vue-flow-save-restore-example-1u7u6t?eslint=1&fontsize=14&hidenavigation=1&module=%2Fsrc%2Fcomponents%2FFlow.vue&theme=light"
+     class="block dark:hidden h-full w-full min-h-[75vh]"
+      title="Vue Flow: Save & Restore Example"
+      allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
+      sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
+  ></iframe>
+</div>