Add boilerplate files and licenses

src/index.tsx

@@ -0,0 +1,23 @@
+import * as Sentry from '@sentry/react';
+import { render } from 'preact';
+import App from './App';
+import { swUpdateAvailableAtom } from './atoms/swUpdate';
+import { store } from './lib/store';
+import './styles.css';
+import { registerSW } from 'virtual:pwa-register';
+
+if (import.meta.env.VITE_SENTRY_DSN) {
+  Sentry.init({
+    dsn: import.meta.env.VITE_SENTRY_DSN,
+    sendDefaultPii: true,
+  });
+}
+
+registerSW({
+  immediate: true,
+  onNeedRefresh() {
+    store.set(swUpdateAvailableAtom, true);
+  },
+});
+
+render(<App />, document.getElementById('app') || document.body);