Add (custom) SimpleSwiftUIView example

[tschob]

No description provided.

[codecov-commenter]

Codecov Report

Merging #20 (b861f62) into main (24ff34a) will increase coverage by 0.01%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   76.63%   76.65%   +0.01%     
==========================================
  Files          64       64              
  Lines        1862     1863       +1     
  Branches      721      722       +1     
==========================================
+ Hits         1427     1428       +1     
  Misses        422      422              
  Partials       13       13              

Flag	Coverage Δ
QAMenu	97.12% <100.00%> (+<0.01%)	⬆️
QAMenuUIKit	61.29% <50.00%> (ø)
QAMenuUtils	94.59% <ø> (ø)

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Impacted Files	Coverage Δ
...AMenu/Public/Data Structure/Items/StringItem.swift	100.00% <ø> (ø)
...s/QAMenuUIKit/Internal/UI/PaneViewController.swift	40.28% <0.00%> (ø)
Sources/QAMenuUIKit/Public/UI/NibView.swift	58.62% <66.66%> (ø)
Sources/QAMenu/Public/Data Structure/Item.swift	100.00% <100.00%> (ø)

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