add or cross-reference the various information to the devdocs

• Add the info from foodsharing-android!248 (merged) (or the link to it) to the devdocs in an appropriate and easy-to-find place. (It is enough to say "you can find the information in this place: ...")

We have also information in the following places:

• https://gitlab.com/foodsharing-dev/foodsharing/-/wikis/home
• https://gitlab.com/foodsharing-dev/foodsharing-android/-/blob/master/README.md
• https://gitlab.com/foodsharing-dev/foodsharing-ios/-/blob/master/ReadMe.md
• https://gitlab.com/foodsharing-dev/foodsharing/-/blob/master/README.md It might be a good idea to integrate all the infos into devdocs.foodsharing.network/ This might need dev community discussion first.