Add a readme

examples/next-example/src/pages/_app.tsx

@@ -0,0 +1,36 @@
+//
+// Copyright (c) Zoe Roux and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for details.
+//
+
+import { Theme, ThemeProvider, useYoshiki } from "yoshiki";
+import { AppProps } from "next/app";
+
+declare module "yoshiki" {
+	export interface Theme {
+		spacing: string;
+		name: string;
+	}
+}
+
+export const theme: Theme = {
+	spacing: "24px",
+	name: "yoshiki",
+};
+
+const AppName = () => {
+	const { css, theme } = useYoshiki();
+
+	return <p {...css({ padding: (theme) => theme.spacing })}>{theme.name}</p>;
+};
+
+const App = ({ Component, pageProps }: AppProps) => {
+	return (
+		<ThemeProvider theme={theme}>
+			<Component {...pageProps} />
+			<AppName />
+		</ThemeProvider>
+	);
+};
+
+export default App;