Updated README.md to include GNUPG2 installation for setup on Windows WSL

[RealRichi3]

Added sudo apt install gnupg2 to the project installation guide (README.md) for Windows subsystem for linux

Fixes #11464

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[codeclimate]

Code Climate has analyzed commit 6b1b724 and detected 0 issues on this pull request.

View more on Code Climate.

[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/8706943290/artifacts/393189494

[codecov]

Codecov Report

Merging #11465 (6b1b724) into main (5d94500) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11465   +/-   ##
=======================================
  Coverage   83.21%   83.21%           
=======================================
  Files          93       93           
  Lines        5772     5772           
=======================================
  Hits         4803     4803           
  Misses        969      969           

Impacted Files	Coverage Δ
app/controllers/images_controller.rb	72.50% <100.00%> (ø)

[RealRichi3]

@jywarren please review my request

[cesswairimu]

Thanks for opening this @RealRichi3, its looking good. Maybe we should add some text before the command smth like "Install gnupg2 if you haven't already: " What do you think?

[RealRichi3]

True, I'll add that

[RealRichi3]

Or better still, since I've already contributed, let me make it a first-time-issue so others can fix it

[cesswairimu]

Sounds great 👍 . Thanks

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