Improve support for VSCode

[amotl]

Hi again,

this tries to improve the situation with #516.

• Improve documentation for creating virtualenv on Windows
• Enable running tests from VSCode

With kind regards,
Andreas.

/cc @psyciknz

[codecov-commenter]

Codecov Report

Merging #539 (b0f47e9) into main (d360c98) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #539   +/-   ##
=======================================
  Coverage   29.25%   29.25%           
=======================================
  Files          82       82           
  Lines        3668     3668           
  Branches      429      429           
=======================================
  Hits         1073     1073           
  Misses       2546     2546           
  Partials       49       49           

Flag	Coverage Δ
unittests	29.25% <ø> (ø)

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