Add product overviews

[VMelnalksnis]

Fixes #225.

[codecov]

Codecov Report

Merging #407 (51e2af2) into master (3837266) will decrease coverage by 1.39%.
The diff coverage is 18.36%.

@@            Coverage Diff             @@
##           master     #407      +/-   ##
==========================================
- Coverage   66.97%   65.58%   -1.40%     
==========================================
  Files         250      261      +11     
  Lines        6883     7064     +181     
  Branches      509      529      +20     
==========================================
+ Hits         4610     4633      +23     
- Misses       2111     2271     +160     
+ Partials      162      160       -2     

Impacted Files	Coverage Δ
...ce/Gnomeshade.Avalonia.Core/MainWindowViewModel.cs	6.36% <0.00%> (-0.30%)	⬇️
...eshade.Avalonia.Core/Reports/Aggregates/Average.cs	0.00% <0.00%> (ø)
...eshade.Avalonia.Core/Reports/Aggregates/Maximum.cs	0.00% <0.00%> (ø)
...meshade.Avalonia.Core/Reports/Aggregates/Median.cs	0.00% <0.00%> (ø)
...eshade.Avalonia.Core/Reports/Aggregates/Minimum.cs	0.00% <0.00%> (ø)
...Gnomeshade.Avalonia.Core/Reports/Aggregates/Sum.cs	0.00% <0.00%> (ø)
...lonia.Core/Reports/Calculations/CalculableValue.cs	0.00% <0.00%> (ø)
...Avalonia.Core/Reports/Calculations/PricePerUnit.cs	0.00% <0.00%> (ø)
....Core/Reports/Calculations/RelativePricePerUnit.cs	0.00% <0.00%> (ø)
...ia.Core/Reports/Calculations/RelativeTotalPrice.cs	0.00% <0.00%> (ø)
... and 5 more

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