docs: translate README to Russian

Initial commit: Study Material Recommender System

update README.md

create README.md

delete README.md

update README.md

Запрос на слияние 'practice10' (#2) из practice10 в master

create readme.md

delete demo/test.png

upload files

update dev/solution.cs

create readme.md

create demo/test.txt

create demo/test.json

update demo/test.csv

create demo/test.csv