Add use-chain example

Author: twhy

packages/example/pages/use-chain.tsx

@@ -0,0 +1,18 @@
+import Link from "next/link";
+import { useChain } from "@cosmos-kit/react-lite";
+import { Button } from "components/button";
+
+export default function () {
+  const cosmoshub = useChain('cosmoshub')
+
+  return <div className="space-y-4 mx-auto max-w-3xl">
+    <pre>
+      <code>const cosmoshub = useChain('cosmoshub');</code>
+    </pre>
+    <Button onClick={() => cosmoshub.connect() }>
+      { cosmoshub.isWalletConnected ? 'Disconnect' : 'Connect' }
+    </Button>
+    <p>Address: {cosmoshub.address}</p>
+    <p className="text-center"><Link href="/use-chains">See useChains</Link></p>
+  </div>;
+}