fix: add Access-Control-Allow-Credentials: true to CORS

Author: nodkz

index.js

@@ -10,7 +10,7 @@ import { expressPort, getExampleNames, resolveExamplePath } from './config';
 import './mongooseConnection';
 
 const server = express();
-server.use(cors({ origin: true }));
+server.use(cors({ origin: true, credentials: true }));
 
 // scan `examples` directory and add
 // - graphql endpoint by uri /exampleDirName