[MNT] Adjust .gitignore

[tpvasconcelos]

What does this implement/fix? Explain your changes.

Small adjustment to .gitignore to ignore common IDE files.

Taken from sktime:

https://github.com/sktime/sktime/blob/0c134d58b7af547be235ce89d81ff8d659406ad8/.gitignore#L128-L135

Does your contribution introduce a new dependency? If yes, which one?

No.

What should a reviewer concentrate their feedback on?

🤷

PR checklist

For all contributions

• I've reviewed the project documentation on contributing
• I've added myself to the list of contributors.
• The PR title starts with either [ENH], [CI/CD], [MNT], [DOC], or [BUG] indicating whether
  the PR topic is related to enhancement, CI/CD, maintenance, documentation, or a bug.

[fkiraly]

Sure, thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b754e93) 84.69% compared to head (6e85f70) 84.73%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #277      +/-   ##
==========================================
+ Coverage   84.69%   84.73%   +0.03%     
==========================================
  Files          43       43              
  Lines        2928     2928              
==========================================
+ Hits         2480     2481       +1     
+ Misses        448      447       -1     

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