doc: add text around collaborative expectations

- add text discussed by the TSC

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

PR-URL: #46121
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Beth Griggs <bethanyngriggs@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Joe Sepi <sepi@joesepi.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>

README.md

@@ -7,6 +7,12 @@ For information on using Node.js, see the [Node.js website][].
 The Node.js project uses an [open governance model](./GOVERNANCE.md). The
 [OpenJS Foundation][] provides support for the project.
 
+Contributors are expected to act in a collaborative manner to move
+the project forward. We encourage the constructive exchange of contrary
+opinions and compromise. The [TSC](./GOVERNANCE.md#technical-steering-committee)
+reserves the right to limit or block contributors who repeatedly act in ways
+that discourage, exhaust, or otherwise negatively affect other participants.
+
 **This project has a [Code of Conduct][].**
 
 ## Table of contents