Chapter 4 of Kotlin codestyle

[orchestr7]

What's done:

1. Introduced 4th chapter of Kotlin codestyle

[codecov]

Codecov Report

Merging #273 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #273   +/-   ##
=========================================
  Coverage     81.68%   81.68%           
  Complexity      927      927           
=========================================
  Files            48       48           
  Lines          2403     2403           
  Branches        742      742           
=========================================
  Hits           1963     1963           
  Misses          173      173           
  Partials        267      267           

Flag	Coverage Δ	Complexity Δ
#unittests	81.68% <ø> (ø)	927.00 <ø> (ø)

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[kentr0w]

LGTM