Update README.md

[natemcmaster]

Link to #485 and clarify project status.

[codecov]

Codecov Report

Merging #488 (e19cc2f) into main (1cb2c24) will decrease coverage by 0.09%.
The diff coverage is n/a.

❗ Current head e19cc2f differs from pull request most recent head cae11bd. Consider uploading reports for the commit cae11bd to get more accurate results

@@            Coverage Diff             @@
##             main     #488      +/-   ##
==========================================
- Coverage   82.21%   82.12%   -0.10%     
==========================================
  Files         106      105       -1     
  Lines        3289     3283       -6     
==========================================
- Hits         2704     2696       -8     
- Misses        585      587       +2     

Impacted Files	Coverage Δ
src/CommandLineUtils/Utilities/DotNetExe.cs	60.00% <0.00%> (-27.50%)	⬇️
...mandLineUtils/HelpText/DefaultHelpTextGenerator.cs	98.02% <0.00%> (-1.32%)	⬇️
src/CommandLineUtils/CommandLineApplication.cs	93.29% <0.00%> (-0.30%)	⬇️
src/CommandLineUtils/IO/Pager.cs	0.00% <0.00%> (ø)
.../CommandLineUtils/Properties/NullabilityHelpers.cs
src/CommandLineUtils/Internal/Util.cs	100.00% <0.00%> (+66.66%)	⬆️

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