Merge pull request #1 from aslv/master

Lecture 3
Merge pull request #1 from aslv/master

lecture 5 video link and demos uploaded
Merge branch 'master' of https://github.com/anniy/1300ruc
Merge branch 'master' of https://github.com/anniy/1300ruc
Merge branch 'master' of https://github.com/anniy/1300ruc