updated react example with todo example

examples/react/src/components/Center.tsx

@@ -0,0 +1,10 @@
+import type { ComponentProps } from "react";
+
+export function Center(props: ComponentProps<"div">) {
+   return (
+      <div
+         {...props}
+         className={"w-full min-h-full flex justify-center items-center " + props.className}
+      />
+   );
+}