[GRASS-git] [OSGeo/grass-website] 5d08e8: News: add FOSS4G 2023 event (#366)

[Markus Neteler]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-website
  Commit: 5d08e87d9e748649f397ec16c13602df298dfc3c
      https://github.com/OSGeo/grass-website/commit/5d08e87d9e748649f397ec16c13602df298dfc3c
  Author: Markus Neteler <neteler at osgeo.org>
  Date:   2023-05-22 (Mon, 22 May 2023)

  Changed paths:
    M README.md
    A content/events/FOSS4G_2022.md
    A content/events/FOSS4G_2023.md

  Log Message:
  -----------
  News: add FOSS4G 2023 event (#366)

- add FOSS4G 2023
- also add missing FOSS4G 2022 (for posterity)
- clarify date format in README.md