user charts

[vtm9]

• Add user langs stats BE
• --wip-- [skip ci]
• add chart

Fixes #ISSUE_ID

[codecov-commenter]

Codecov Report

Base: 73.63% // Head: 73.82% // Increases project coverage by +0.19% 🎉

Coverage data is based on head (159bf98) compared to base (474416d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1189      +/-   ##
==========================================
+ Coverage   73.63%   73.82%   +0.19%     
==========================================
  Files         136      136              
  Lines        2735     2732       -3     
==========================================
+ Hits         2014     2017       +3     
+ Misses        721      715       -6     

Impacted Files	Coverage Δ
services/app/lib/codebattle/user/stats.ex	100.00% <100.00%> (+66.66%)	⬆️

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