README: add information on team support for PMCRs

This was discussed during
https://wiki.postmarketos.org/wiki/Core_Contributors_Meetings#2025-03-03_(CC_+_TC)
as a lesson learned from the first PMCR to improve the worflow and
make sure PMCRs make it to completion.

README.md

@@ -117,6 +117,12 @@ disagreeing, please always keep in mind the examples of [positive
 behavior](https://postmarketos.org/coc/#our-standards) in the Code of Conduct,
 and try to work towards them.
 
+In the early stages of the PMCR a member of the team (currently @pabloyoyoista)
+will help the author make sure that the conversation stays focused, and that
+people whose feedback is needed are reached. As discussions mature, there will
+be either a CC or TC designated to help the author make decisions, and make
+sure the PMCR does not stall.x
+
 ## Finalizing a PMCR
 
 The author(s) or the postmarketOS team might come to the conclusion that the