Add KDevelop to .gitignore

[mosfet80]

Add KDevelop to .gitignore

Description

Please explain the changes you made, including a reference to the related issue if applicable

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[rhaschke]

You should better add such files to your global git ignore file:
https://stackoverflow.com/questions/7335420/global-git-ignore

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (848c062) to head (ee21c49).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #3678       +/-   ##
==========================================
- Coverage   46.24%   0.00%   -46.23%     
==========================================
  Files         726      51      -675     
  Lines       59483    5938    -53545     
  Branches     7624    1057     -6567     
==========================================
- Hits        27504       0    -27504     
+ Misses      31813    5938    -25875     
+ Partials      166       0      -166     

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