doc: add @RaisinTen to the TSC

Refs: nodejs/TSC#1141

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: nodejs#41419
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Mary Marchini <oss@mmarchini.me>

Author: mhdawson

README.md

@@ -194,6 +194,8 @@ For information about the governance of the Node.js project, see
   **Mary Marchini** <<oss@mmarchini.me>> (she/her)
 * [MylesBorins](https://github.com/MylesBorins) -
   **Myles Borins** <<myles.borins@gmail.com>> (he/him)
+* [RaisinTen](https://github.com/RaisinTen) -
+  **Darshan Sen** <<raisinten@gmail.com>> (he/him)
 * [richardlau](https://github.com/richardlau) -
   **Richard Lau** <<rlau@redhat.com>>
 * [ronag](https://github.com/ronag) -