Initialize frontend app (#112)

skyvern-frontend/src/App.tsx

@@ -0,0 +1,5 @@
+function App() {
+  return <></>;
+}
+
+export default App;

skyvern-frontend/src/main.tsx

@@ -0,0 +1,10 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App.tsx";
+import "./index.css";
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);

skyvern-frontend/src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />