added subpages for helloworld and clash, added game contract to config.json for usage in frontend

crypto_clash_frontend/app/layout.tsx

@@ -13,8 +13,8 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: "Create Next App",
-  description: "Generated by create next app",
+  title: "Crypto Clash",
+  description: "Challenge yourself with competitive battles",
 };
 
 export default function RootLayout({