docs: add bundler entry example for vite-plugin-wasm

Author: magic-akari

README.md

@@ -51,6 +51,12 @@ await init();
 // ...
 ```
 
+Or use the `./bundler` entry with [vite-plugin-wasm](https://www.npmjs.com/package/vite-plugin-wasm)
+
+```javascript
+import { format } from "@wasm-fmt/lua_fmt/bundler";
+```
+
 ## Entry Points
 
 - `.` - Auto-detects environment (Node.js uses node, Webpack uses bundler, default is ESM)