add footnote to both authors

Author: dionhaefner

paper.md

@@ -8,7 +8,7 @@ tags:
  - parallel computing
 
 authors:
- - name: Dion Häfner
+ - name: Dion Häfner^[Contributed equally, order determined by coin flip.]
  orcid: 0000-0002-4465-7317
  affiliation: 1
  - name: Filippo Vicentini^[Contributed equally, order determined by coin flip.]