Add buddy icon for example as avatar dummy. It bases on group.svg
Merge pull request #4 from Schlumpf/master

This was added in my latest commit (https://github.com/ItsDuke/Tox-UI/commit/837db3d6c4462b568a5b4dcd3732862d0d6c2601). I deeply apologize for taking so long to get to this, it was buried under mountains of emails :(