Implement Undo command

[AArnott]

No description provided.

[codecov-commenter]

Codecov Report

Merging #64 (e96d019) into main (e4dec53) will increase coverage by 0.63%.
The diff coverage is 60.88%.

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   37.65%   38.29%   +0.63%     
==========================================
  Files          64       66       +2     
  Lines        3914     4105     +191     
==========================================
+ Hits         1474     1572      +98     
- Misses       2440     2533      +93     

Impacted Files	Coverage Δ
src/MoneyMan.WPF/MainWindow.xaml	66.66% <ø> (ø)
...nagement.Tests/ViewModels/AccountViewModelTests.cs	0.00% <0.00%> (ø)
...nt.Tests/ViewModels/AccountsPanelViewModelTests.cs	0.00% <0.00%> (ø)
....Tests/ViewModels/CategoriesPanelViewModelTests.cs	0.00% <0.00%> (ø)
...agement.Tests/ViewModels/DocumentViewModelTests.cs	0.00% <0.00%> (ø)
.../MoneyMan.WPF/Converters/EnumToOrdinalConverter.cs	50.00% <50.00%> (ø)
src/MoneyMan.WPF/MainWindow.xaml.cs	22.22% <50.00%> (+1.44%)	⬆️
...neyManagement/ViewModels/AccountsPanelViewModel.cs	95.87% <83.33%> (-0.83%)	⬇️
...yManagement/ViewModels/CategoriesPanelViewModel.cs	90.90% <94.87%> (-0.22%)	⬇️
...nk.MoneyManagement/ViewModels/DocumentViewModel.cs	87.50% <98.59%> (+2.92%)	⬆️
... and 8 more

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