Common contributing rules

[malaskowski]

Description

Unified contribution rules for all Knot.x repositories.

Motivation and Context

https://github.com/Knotx/knotx/issues/511

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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I hereby agree to the terms of the Knot.x Contributor License Agreement.

[codecov[bot]]

Codecov Report

Merging #58 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #58   +/-   ##
=========================================
  Coverage     84.36%   84.36%           
  Complexity      241      241           
=========================================
  Files            27       27           
  Lines           921      921           
  Branches         65       65           
=========================================
  Hits            777      777           
  Misses          106      106           
  Partials         38       38           

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