Release session summary from Montreal Collaborator Summit (#234)

2019-12-Montreal/release-session.md

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+Node.js Collaborator Summit - Release Session Agenda
+
+- What the release team do and their responsibilities
+- Onboarding technique
+    - Action to arrange formal shadowing/mentoring https://github.com/nodejs/release/issues/511
+    - Asked attendees to register their interest.
+- @MylesBorins walked through the release process documented in https://github.com/nodejs/node/blob/master/doc/releases.md
+- Referenced open backports and how to backport to release lines - https://github.com/nodejs/node/blob/master/doc/guides/backporting-to-release-lines.md
+- Call for volunteers
+- Call for automation