Manage Summer 2023 team presence

[bigludo7]

A file to manage 2023 summer presence to plan our bi weekly call

What type of PR is this?

Add one of the following kinds:

• subproject management

What this PR does / why we need it:

Each member has to update it. This fill will be removed at the end of the summer period.

Which issue(s) this PR fixes:

Fixes #

Changelog input

Additional documentation

docs

[bigludo7]

Agreed to keep Aug 1st & cancel Aug 15th.