Add landing page for voicebox.sh

- Created a new landing page using Next.js 16, featuring a modern design with Tailwind CSS.
- Implemented essential components including Header, Footer, and DownloadSection for user navigation and download options.
- Configured Tailwind CSS and PostCSS for styling, and set up TypeScript for type safety.
- Added a README with setup instructions, project structure, and deployment guidelines.
- Integrated GitHub links for easy access to the repository and releases.
- Established a consistent UI with reusable components and responsive design.

landing/src/app/layout.tsx

@@ -0,0 +1,39 @@
+import type { Metadata } from 'next';
+import { Inter } from 'next/font/google';
+import './globals.css';
+import { Header } from '@/components/Header';
+import { Footer } from '@/components/Footer';
+
+const inter = Inter({ subsets: ['latin'], variable: '--font-sans' });
+
+export const metadata: Metadata = {
+  title: 'voicebox - Professional Voice Cloning Desktop App',
+  description: 'Near-perfect voice cloning powered by Qwen3-TTS. Desktop app for Mac, Windows, and Linux. Multi-sample support, smart caching, local or remote inference.',
+  keywords: ['voice cloning', 'TTS', 'Qwen3', 'desktop app', 'AI voice'],
+  openGraph: {
+    title: 'voicebox',
+    description: 'Professional voice cloning with Qwen3-TTS',
+    type: 'website',
+    url: 'https://voicebox.sh',
+  },
+};
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <html lang="en" suppressHydrationWarning className="dark">
+      <body className={inter.variable}>
+        <div className="relative min-h-screen bg-background font-sans flex flex-col">
+          <Header />
+          <main className="container mx-auto px-4 sm:px-6 md:px-4 flex-1 py-4 sm:py-6 md:py-0">
+            {children}
+          </main>
+          <Footer />
+        </div>
+      </body>
+    </html>
+  );
+}