Update README.md

Author: justheuristic

week04_data_parallel/README.md

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 * Lecture: [link](./lecture.pdf)
 * Seminar: [link](./practice.ipynb)
 * Homework: see the [homework](./homework) folder
+* Video: [lecture](https://disk.yandex.ru/i/44cBFo8zKSUYjg), [seminar](https://disk.yandex.ru/i/uxzBjkKYtGFLXA)
 
 ## Further reading
 * [Numba parallel](https://numba.pydata.org/numba-doc/dev/user/parallel.html) - a way to develop threaded parallel code in python without GIL