Adding EditorConfig configuration

[Myllyenko]

In this PR, I've added an EditorConfig configuration that enables usage of Intellij autoformatting in accordance with configured Checkstyle rules and existing code style. It will help newcomers to avoid Checkstyle issues.

[pnv1]

Isn't trailing whitespaces the reason why you've decided to add this configuration?
trim_trailing_whitespace = true

[Myllyenko]

Isn't trailing whitespaces the reason why you've decided to add this configuration? trim_trailing_whitespace = true

Oh, thanks, added it to the config :)

Actually, yes, it was one of the two main reasons (the second one is autoformatting of imports).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.19%. Comparing base (959538e) to head (f4bd9b7).
Report is 13 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #340      +/-   ##
============================================
- Coverage     47.34%   47.19%   -0.16%     
  Complexity     1750     1750              
============================================
  Files           309      311       +2     
  Lines         12463    12499      +36     
  Branches       1232     1238       +6     
============================================
- Hits           5901     5899       -2     
- Misses         6102     6140      +38     
  Partials        460      460              

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