doc: add XadillaX to collaborators

PR-URL: #14388
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: XadillaX

README.md

@@ -448,6 +448,8 @@ more information about the governance of the Node.js project, see
 **Daijiro Wachi** <daijiro.wachi@gmail.com> (he/him)
 * [whitlockjc](https://github.com/whitlockjc) -
 **Jeremy Whitlock** <jwhitlock@apache.org>
+* [XadillaX](https://github.com/XadillaX) -
+**Khaidi Chu** <i@2333.moe> (he/him)
 * [yorkie](https://github.com/yorkie) -
 **Yorkie Liu** <yorkiefixer@gmail.com>
 * [yosuke-furukawa](https://github.com/yosuke-furukawa) -