feat: add readme

Author: ryoppippi

README.md

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+# svelte-preprocess-css-modules
+
+Successor of [svelte-preprocess-cssmodules](https://github.com/micantoine/svelte-preprocess-cssmodules)
+
+## Installation
+
+```bash
+npx nypm add -D svelte-preprocess-css-modules
+```
+
+## Usage
+
+### Config
+
+```javascript
+// svelte.config.js
+
+import cssModules from 'svelte-preprocess-css-modules';
+
+export default {
+	preprocess: cssModules({/* options */}),
+};
+```
+
+See [options](./src/options.ts) for more information.
+
+### Svelte
+
+```svelte
+<!-- App.svelte -->
+<script>
+	import styles from './App.module.css';
+</script>
+
+<div class={styles.container}>
+	<h1 class={styles.title}>Hello World!</h1>
+</div>
+```
+
+```css
+/* App.module.css */
+.container {
+	display: flex;
+	justify-content: center;
+	align-items: center;
+}
+
+.title {
+	color: red;
+}
+```
+
+get converted into:
+
+```svelte
+<script>
+	const styles = {
+		container: 'App_module_container',
+		title: 'App_module_title',
+	};
+</script>
+
+<div class={styles.container}>
+	<h1 class={styles.title}>Hello World!</h1>
+</div>
+
+<style>
+  .App_module_container {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+  }
+
+  .App_module_title {
+    color: red;
+  }
+</style>
+```
+
+## License
+
+[MIT](./LICENSE)