chore: add support option (#1853)

packages/lib/plain/client.ts

@@ -0,0 +1,7 @@
+import { PlainClient } from '@team-plain/typescript-sdk';
+
+import { env } from '@documenso/lib/utils/env';
+
+export const plainClient = new PlainClient({
+  apiKey: env('NEXT_PRIVATE_PLAIN_API_KEY') ?? '',
+});