Write paragraph 4.1 Outline of the design

[illia-kriukov]

Describe outline of the design:

• High-level description of the design.
  See details in the report document https://docs.google.com/document/d/1fRFAq2tTrNhpVkYdQO_XkQ6LCikQSEq2bGiZA2Kungc/edit