all first lesson by Burkova
Delete ZadachaA.py
Delete ZadachaB.py
Delete ZadachaC.py
Delete ZadachaD1.py
Delete ZadachaD2.py
Delete ZadachaD3.py
Delete ZadachaD4.py
Delete ZadachaD5.py
Delete ZadachaZ.py
add first lesson by Burkova
add 1 lesson
Merge pull request #1 from flutesa/master

first pool request from Burkova