docs(examples): next proxy

https://nextjs.org/docs/pages/building-your-application/routing/api-routes
https://github.com/chimurai/http-proxy-middleware/blob/example-nextjs/recipes/servers.md#nextjs

examples/next-app/pages/api/_proxy.ts

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+import type { NextApiRequest, NextApiResponse } from 'next';
+import { createProxyMiddleware } from '../../../../dist';
+
+// singleton
+export const proxyMiddleware = createProxyMiddleware<NextApiRequest, NextApiResponse>({
+  target: 'http://jsonplaceholder.typicode.com',
+  changeOrigin: true,
+  pathRewrite: {
+    '^/api/users': '/users',
+  },
+  logger: console,
+});

examples/next-app/pages/api/users.ts

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+import type { NextApiRequest, NextApiResponse } from 'next';
+import { proxyMiddleware } from './_proxy';
+
+export default function handler(req: NextApiRequest, res: NextApiResponse) {
+  proxyMiddleware(req, res, (result: unknown) => {
+    if (result instanceof Error) {
+      throw result;
+    }
+  });
+}
+
+export const config = {
+  api: {
+    externalResolver: true,
+    // Uncomment to fix stalled POST requests
+    // https://github.com/chimurai/http-proxy-middleware/issues/795#issuecomment-1314464432
+    bodyParser: false,
+  },
+};