To read and to do

1. Fix code style: https://pythonworld.ru/osnovy/pep-8-rukovodstvo-po-napisaniyu-koda-na-python.html
2. Seperate class responsibility
3. Multitier architecture: https://en.wikipedia.org/wiki/Multitier_architecture
4. Implement SQL-stored procedures: https://en.wikipedia.org/wiki/Stored_procedure
5. Ask about DB rollover and docer (something I know from ml_course)

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New features plan: 0. Create shared library. With open-rights books

1. Add .fb2 file to input
2. Make audio-version of text piece
3. Add pictures from book