[ES] Add People/User group

[agatemosu]

Self-check

• The changes are tested against the contribution checklist

[osu-wiki-observatory]

Someone else has edited same files as you did. Please check their changes in case they conflict with yours:

• Add Announcement messages #9054, files:
  • wiki/People/User_group/en.md

[osu-wiki-observatory]

Your translation may be missing new pending changes to English articles. Please update your translation after they are merged:

• Add Announcement messages #9054, files:
  • wiki/People/User_group/en.md

[TicClick]

for future pull requests, please edit original articles (en.md) and translations separately, without putting them into the same PR, unless the changes you are making are related (for example, in this case they are not)

[agatemosu]

for future pull requests, please edit original articles (en.md) and translations separately, without putting them into the same PR, unless the changes you are making are related (for example, in this case they are not)

okok, that's why I have put it in another commit