Added link to Atmosfair (German gGmbH for CO2 compensation)

[DonHege]

Link URL

https://atmosfair.de/en

Description

Added a link to Atmosfair gGmbH, a German non-profit company which lets you compensate for CO2 emissions you caused. Compensations are mostly done in developing countries. The page itself states, that you should try to reduce emissions in the first place and only compensate for emissions which can't be avoided.

Checklist

• [X] Only one item/change is in this pull request
• [X] Addition in chronological order (bottom of category) or sorted by most recent date (for articles)
• [X] It's in English