docs: Add Softonic as user

[rccrdpccl]

Fulfilling my obligation to check all tick boxes at #5521

[codecov]

Codecov Report

Merging #5522 (9db252b) into master (dcc5166) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 9db252b differs from pull request most recent head dcefdac. Consider uploading reports for the commit dcefdac to get more accurate results

@@            Coverage Diff             @@
##           master    #5522      +/-   ##
==========================================
- Coverage   46.76%   46.73%   -0.04%     
==========================================
  Files         240      240              
  Lines       15004    15004              
==========================================
- Hits         7017     7012       -5     
- Misses       7089     7093       +4     
- Partials      898      899       +1     

Impacted Files	Coverage Δ
workflow/metrics/server.go	12.50% <0.00%> (-4.17%)	⬇️
workflow/controller/operator.go	70.69% <0.00%> (-0.28%)	⬇️
cmd/argoexec/commands/emissary.go	50.00% <0.00%> (+1.56%)	⬆️

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