Add cigdem to contributors

[uellue]

EMPAD test files

Contributor Checklist:

• I have added or updated my entry in the creators.json file
• I have added a changelog entry for my contribution
• I have added/updated documentation for all user-facing changes
• I have added/updated test cases
• I have included the rebuilt production build of the client (only if changes were made to the GUI)

Reviewer Checklist:

• /azp run libertem.libertem-data passed
• No import of GPL code from MIT code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.29%. Comparing base (86f94e7) to head (1cb6461).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1639      +/-   ##
==========================================
- Coverage   69.94%   66.29%   -3.65%     
==========================================
  Files         325      325              
  Lines       27255    27255              
  Branches     3139     3139              
==========================================
- Hits        19063    18069     -994     
- Misses       7630     8665    +1035     
+ Partials      562      521      -41     

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[sk1p]

LGTM!