add RTQC oxygen meeting during GROOM II workshop

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[soerenthomsen]

FYI @vturpin

This PR prepares the meeting on Thursday June 23 15:00-16:30 CEST

Happy to share it again as I did the the salinity one.

[callumrollo]

Is the Agenda in point 10 meant to link to something?

[soerenthomsen]

Just added the link to the "final" md file. So it will be the correct one in the longer term.