LiveQuery SwiftUI example in playgrounds

[cbaker6]

• A simple example to show how to use a live query subscription as a view model for SwiftUI

[codecov]

Codecov Report

Merging #77 (ed8a3da) into main (6ad40d1) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   79.03%   79.01%   -0.03%     
==========================================
  Files          61       61              
  Lines        4903     4903              
==========================================
- Hits         3875     3874       -1     
- Misses       1028     1029       +1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseObject.swift	75.94% <0.00%> (-0.29%)	⬇️

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