Create CodingPerfTests executable

[pokryfka]

also updated README and CI workflow

[codecov]

Codecov Report

Merging #57 into main will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
+ Coverage   90.73%   90.79%   +0.06%     
==========================================
  Files          40       39       -1     
  Lines        3378     3325      -53     
==========================================
- Hits         3065     3019      -46     
+ Misses        313      306       -7     

Impacted Files	Coverage Δ
...sts/LearningTests/FoundationJSONEncoderTests.swift	91.83% <0.00%> (-1.15%)	⬇️
...sts/LearningTests/FoundationJSONDecoderTests.swift	93.29% <0.00%> (-0.08%)	⬇️
...arningTests/FoundationJSONSerializationTests.swift

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[fabianfett]

@pokryfka Thank you. This is great! I haven‘t known about swift run before.

[pokryfka]

👍

I was surprised binary was linked without defining executable product :-)
(maybe that was because there is just one file and external libs are dynamically linked?)

.executable(name: "CodingPerfTests", targets: ["CodingPerfTests"]),

swift run -c release is debatable but I think its good in that it does not assume .build structure which, event though unlikely, might change, its an implementation detail after all