doc: add onboarding details for ambassador program

PR-URL: #55284
Reviewed-By: Moshe Atlow <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Paolo Insogna <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Ulises Gascón <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

Author: marco-ippolito

doc/contributing/advocacy-ambasador-program.md

@@ -39,6 +39,15 @@ a discussion issue with the nomination in
 [nodejs/collaborators](https://github.com/nodejs/collaborators/)
 titled `Nomination X to be an Ambassador`, where X is the name of the person
 being nominated.
+If there is no objection within 14 days, the nomination is approved.
+
+## Onboarding
+
+To onboard an ambassador, a member of the TSC will:
+
+* \[] Add the ambassador to the nodejs/ambassadors team.
+* \[] Add the ambassador to the nodejs/ambassadors `README.md`.
+* \[] Add the ambassador to the OpenJS Slack channel.
 
 ## Reviewing content