Add readme and repository architecture description file

[eduv09]

Fixes #24

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.68%. Comparing base (2de453c) to head (180d077).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #23   +/-   ##
========================================
  Coverage    73.68%   73.68%           
========================================
  Files            4        4           
  Lines           57       57           
  Branches        18       10    -8     
========================================
  Hits            42       42           
  Misses          15       15           

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