Add software publications and contributions

@jandt-desy I added both software publications, which I'm aware of, as well as contributions to Open Source software in general.

• Direct link: https://hifis-review-app.hzdr.de/review-apps/hifis-hifis-net/software-publications/mission/publications#software-publications

Coud you please check.

changed the description

added 1 commit

• 74ab2e7c - some rearrangements

Compare with previous version

Thank you and fine with me!

I rearranged headlines etc. slightly, hope that's fine too

Merging when ready.

merged

mentioned in commit d388f715