docs: update readme

Author: lepture

README.md

@@ -1,2 +1,81 @@
-# shiki-transformers
-Shiki transformers used by Typlog
+# @typlog/shiki-transformers
+
+Shiki transformers by Typlog.
+
+## Install
+
+Install via npm:
+
+```
+npm i @typlog/shiki-transformers
+```
+
+Import from CDN:
+
+```html
+<script type="module">
+  import { transformerLineHighlight } from 'https://esm.sh/@typlog/shiki-transformers'
+</script>
+```
+
+## Usage
+
+```ts
+import { codeToHtml } from 'shiki'
+import { transformerLineHighlight } from '@typlog/shiki-transformers'
+
+const code = `console.log('a')
+console.log('b')
+console.log('c')
+console.log('e')
+console.log('f')
+console.log('g')
+console.log('h')
+`
+const html = await codeToHtml(code, {
+  lang: 'ts',
+  theme: 'nord',
+  transformers: [
+    transformerLineHighlight({
+      highlight: '1,3-5',
+      showLines: true,
+    }),
+  ],
+})
+```
+
+## Options
+
+```ts
+export interface TransformerHighlightOptions {
+  /**
+   * Lines to be highlighted
+   */
+  highlight?: string;
+
+  /**
+   * Class for highlighted lines
+   *
+   * @default 'highlighted'
+   */
+  className?: string;
+
+  /**
+   * Line numbers starts from
+   *
+   * @default 1
+   */
+  lineStart?: number;
+
+  /**
+   * Display line numbers
+   *
+   * @default false
+   */
+  showLines?: boolean;
+}
+```
+
+## License
+
+MIT License