add config for markdownlint

[mimmi20]

Fixes #14

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Manifest Files

[codeclimate]

Code Climate has analyzed commit 7fa1a29 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e844a72) 100.00% compared to head (7fa1a29) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #17   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        29        29           
===========================================
  Files              4         4           
  Lines             97        97           
===========================================
  Hits              97        97           

Flag	Coverage Δ
php-8.1	100.00% <ø> (ø)
phpunit	100.00% <ø> (ø)
ubuntu-20.04	100.00% <ø> (ø)

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