Add software spotlight OpenGeoSys

👉 Review here 👈

Closes #301 (closed)

/edit by @christian.meessen

Checklist for reviewers

• File size of images is not too large
• License is named by SPDX identifier if possible
• All links are pointing to the right place
• Wait for !477 (merged) to be merged
• update date_added attribute to date of merge