Add WireMock.Net.WebApplication.NET6 example

[StefH]

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[codecov]

Codecov Report

Merging #737 (5c4f51b) into master (2a1d14b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #737   +/-   ##
=======================================
  Coverage   75.55%   75.55%           
=======================================
  Files         175      175           
  Lines        6353     6353           
  Branches      651      651           
=======================================
  Hits         4800     4800           
  Misses       1359     1359           
  Partials      194      194           

Impacted Files	Coverage Δ
...ireMock.Net/ResponseBuilders/Response.WithProxy.cs	100.00% <ø> (ø)

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