Common contributing rules

[malaskowski]

Description

Unified contribution rules for all Knot.x repositories.

Motivation and Context

Knotx/knotx#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:

• 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]

Codecov Report

Merging #159 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #159   +/-   ##
=========================================
  Coverage     90.83%   90.83%           
  Complexity     1618     1618           
=========================================
  Files           153      153           
  Lines          6776     6776           
  Branches        184      184           
=========================================
  Hits           6155     6155           
  Misses          527      527           
  Partials         94       94           

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