doc: add gengjiawen to collaborators

PR-URL: #28322
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

Author: gengjiawen

README.md

@@ -300,6 +300,8 @@ For information about the governance of the Node.js project, see
 **George Adams** <george.adams@uk.ibm.com> (he/him)
 * [geek](https://github.com/geek) -
 **Wyatt Preul** <wpreul@gmail.com>
+* [gengjiawen](https://github.com/gengjiawen) -
+**Jiawen Geng** <technicalcute@gmail.com>
 * [gibfahn](https://github.com/gibfahn) -
 **Gibson Fahnestock** <gibfahn@gmail.com> (he/him)
 * [gireeshpunathil](https://github.com/gireeshpunathil) -