DOC: add tabs with Kotlin code for samples (manual chapter 10: Validation)

[deining]

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[remkop]

Thanks again for the PR!

Let me know what you think about the idea to leave out the implements Runnable from SingleOptionValidationExample to keep it as small as possible.

[remkop]

I was thinking to leave out the implements Runnable. The main point of this example is that apps can use an @Option-annotated method to do validation.

I think it is okay to for some examples to be fragments (as opposed to a fully executable program). Sometimes that helps to keep the example focused and communicates the point better.

[codecov-io]

Codecov Report

Merging #1223 into master will not change coverage.
The diff coverage is n/a.

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##             master    #1223   +/-   ##
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  Coverage     94.33%   94.33%           
  Complexity      455      455           
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  Files             2        2           
  Lines          6676     6676           
  Branches       1796     1796           
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  Hits           6298     6298           
  Misses          102      102           
  Partials        276      276           

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[remkop]

Great, thank you!