DOCUMENTATION: Add starter react documentation (#1888)

src/Documentation/doc/index.md

@@ -47,6 +47,7 @@
 - [Learn to program](programming/learn.md)
 - [Remote API](programming/remote_api.md)
 - [Game frozen or stuck?](programming/game_frozen.md)
+- [React](programming/react.md)
 - [Tools & Resources](help/tools_and_resources.md)
 - [Changelog](changelog.md)
 - [Changelog - Legacy v1](changelog-v1.md)

src/Documentation/doc/programming/react.md

@@ -0,0 +1,29 @@
+# How to use React in game
+
+Since v2.7.0, Bitburner supports React and TypeScript out of the box. You can use the jsx syntax inside `.jsx` and `.tsx` files.
+
+## Example
+
+Use `ns.printRaw` and `ns.tprintRaw` to render React elements in the logs and terminal.
+
+```tsx
+// timer.tsx
+function Timer() {
+  const [seconds, setSeconds] = React.useState(0);
+
+  React.useEffect(() => {
+    const interval = setInterval(() => {
+      setSeconds((seconds) => seconds + 1);
+    }, 1000);
+    return () => clearInterval(interval);
+  }, []);
+
+  return <div>Seconds: {seconds}</div>;
+}
+
+export async function main(ns: NS) {
+  ns.tail();
+  ns.printRaw(<Timer />);
+  await ns.asleep(10000);
+}
+```