Add English mkdocs

[wm-wm-wm]

Change Summary

Add directory with markdown version of documentation.

Related issue number

Checklist

• [ ] Commit message and PR title is comprehensive
• [ ] Keep the change as small as possible
• [ ] Unit and integration tests for the changes exist
• [ ] Tests pass on CI and coverage does not decrease
• [ ] Documentation reflects the changes where applicable
• [ ] docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change (see CONTRIBUTING.rst for details.)
• [ ] My PR is ready to review.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.67%. Comparing base (407f593) to head (9d06b75). Report is 21 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #367      +/-   ##
===========================================
+ Coverage    92.36%   92.67%   +0.30%     
===========================================
  Files          229      229              
  Lines        10245    10247       +2     
  Branches      1021     1021              
===========================================
+ Hits          9463     9496      +33     
+ Misses         587      564      -23     
+ Partials       195      187       -8     

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