Add Vite playground for local development

npm run dev boots a Vite + Svelte 5 server at localhost:5173, importing
GraphiQL.svelte directly from source/library. HMR reflects changes
without a package rebuild. Points at the public Countries API by default
— swap playground/src/App.svelte for your own endpoint.

1 files changed, 10 insertions, 0 deletions

diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..be9ad40
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,10 @@
+import { svelte } from "@sveltejs/vite-plugin-svelte";
+import { defineConfig } from "vite";
+
+export default defineConfig({
+  plugins: [svelte()],
+  root: "playground",
+  server: {
+    port: 5173
+  }
+});