Add full-stack questions

src/data/question-groups/full-stack/content/code-splitting.md

@@ -0,0 +1,17 @@
+**Code splitting** breaks a large application into smaller bundles that are loaded only when needed.
+
+**Benefits**:
+* Reduces initial load time by loading only essential code and downloading the rest when needed.
+* Improves performance for slower networks by allowing webapp use much sooner.
+
+**Example using React's `lazy` and `Suspense`**:
+```javascript
+const LazyComponent = React.lazy(() => import('./Component'));
+
+function App() {
+  return (
+    <Suspense fallback={<div>Loading...</div>}>
+      <LazyComponent />
+    </Suspense>
+  );
+}