doc: fix known issues

README.md

@@ -61,6 +61,23 @@ yarn run lint --fix
 
 Based on current testing, Cloudflare and Cloudflare-based edge function runtimes (Vercel) are not able to correctly request the DeepL server, and a 525 error occurs, a detailed description of the issue can be found [here](https://github.com/cloudflare/workerd/issues/776).
 
+For this case, it can be solved using the [DeepL proxy server](https://github.com/ifyour/deepl-proxy), refer to Deploying to Cloudflare Code:
+
+```ts
+import { Hono } from 'hono'
+import { query } from '@ifyour/deeplx'
+
+const app = new Hono()
+
+app.post('/translate', async c => {
+    const params = await c.req.json()
+    const result = await query(params, { proxyEndpoint: 'https://ideepl.vercel.app/jsonrpc' })
+    return c.json(result, result.code)
+  })
+
+export default app
+```
+
 ## License
 
 DeepLx is available under the MIT license.