doc: add ryzokuken to collaborators

PR-URL: https://github.com/nodejs/node/pull/20081
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

README.md

@@ -472,6 +472,8 @@ For more information about the governance of the Node.js project, see
 **Ingvar Stepanyan** <me@rreverser.com>
 * [rvagg](https://github.com/rvagg) -
 **Rod Vagg** <rod@vagg.org>
+* [ryzokuken](https://github.com/ryzokuken) -
+**Ujjwal Sharma** <usharma1998@gmail.com> (he/him)
 * [saghul](https://github.com/saghul) -
 **Saúl Ibarra Corretgé** <saghul@gmail.com>
 * [sam-github](https://github.com/sam-github) -