Adds odacer Finanzsoftware GmbH

[simonneutert]

Description

adds https://www.odacer.com / https://www.papierkram.de

Checklist

• [x] I confirm that I've tried my best to follow the contributing instructions from the readme.
  • [ ] I needed to make an exception. I've explained it in the description above.
• [x] I've made sure that the company description is written in the third person (or left empty, since it's optional).
• [x] I've added a logo that is square, has a format of .jpeg, .png or .svg and doesn't exceed 50KB.