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

crypto_clash_frontend/app/clash/page.tsx

@@ -0,0 +1,11 @@
+"use client";
+
+
+export default function Clash() {
+  return (
+    <div>
+      <h1>Clash Page</h1>
+      <p>This is the Clash page content.</p>
+    </div>
+  );
+}