docs(users): add gitpod

[ghuntley]

Checklist:

• My organization is added to USERS.md.

With 🧡 from Gitpod.

[sarabala1979]

@ghuntley Can you revert the extra / here?

[codecov]

Codecov Report

Merging #6466 (ebc83e0) into master (0f6f362) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head ebc83e0 differs from pull request most recent head 6bcff4e. Consider uploading reports for the commit 6bcff4e to get more accurate results

@@            Coverage Diff             @@
##           master    #6466      +/-   ##
==========================================
+ Coverage   48.45%   48.46%   +0.01%     
==========================================
  Files         260      260              
  Lines       18713    18713              
==========================================
+ Hits         9067     9070       +3     
+ Misses       8654     8652       -2     
+ Partials      992      991       -1     

Impacted Files	Coverage Δ
cmd/argo/commands/get.go	58.30% <0.00%> (-0.59%)	⬇️
workflow/controller/operator.go	72.48% <0.00%> (+0.24%)	⬆️

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[alexec]

Just admin to fix README.md and merge.