docs: added contributing guidelines

[MarvinJWendt]

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[codecov]

Codecov Report

Merging #51 (caee02b) into main (8d0a5eb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   87.69%   87.69%           
=======================================
  Files          10       10           
  Lines         577      577           
=======================================
  Hits          506      506           
  Misses         37       37           
  Partials       34       34           

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