docs: add i18n readme

Author: twlite

packages/i18n/README.md

@@ -0,0 +1,22 @@
+# `@commandkit/i18n`
+
+A commandkit plugin for i18next integration.
+
+# Installation
+
+```sh
+$ npm i @commandkit/i18n
+```
+
+# Usage
+
+Add the following to your commandkit config:
+
+```ts
+import { defineConfig } from "commandkit"
+import { i18n } from "@commandkit/i18n"
+
+export default defineConfig({
+  plugins: [i18n()]
+})
+```