Add examples for using rive-react

examples/basic/src/App.js

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+import Rive from "rive-react";
+
+function App() {
+  return (
+    // The animation will fit to the parent element.
+    <div style={{ height: "500px", width: "500px" }}>
+      <Rive src="poison-loader.riv" autoplay />
+    </div>
+  );
+}
+
+export default App;

examples/basic/src/index.js

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+import React from "react";
+import ReactDOM from "react-dom";
+import App from "./App";
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById("root")
+);