Bug/138 guidelines element

[Sevitas]

Motivation

Which issue does this fix? Fixes #138

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[codecov]

Codecov Report

Merging #139 (ad773bb) into vNext (fb33841) will decrease coverage by 0.27%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##            vNext     #139      +/-   ##
==========================================
- Coverage   87.29%   87.01%   -0.28%     
==========================================
  Files          23       23              
  Lines         842      847       +5     
  Branches       78       79       +1     
==========================================
+ Hits          735      737       +2     
- Misses         88       91       +3     
  Partials       19       19              

Impacted Files	Coverage Δ
...ico.Kontent.ModelGenerator.Core/Common/Property.cs	96.61% <66.66%> (-3.39%)	⬇️
...o.Kontent.ModelGenerator.Core/CodeGeneratorBase.cs	49.36% <100.00%> (+0.01%)	⬆️

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