add hw3 commands

robim merge request na 2. krat, preto som vymazava branch hw3 z origin remote

 2039  git pull upstream main

 2040  git switch -c hw3

 2043  cd class3_homework/

 2046  git status

 2047  git add 525125.txt 

 2048  git commit -m "add hw3-525125.txt file "

 2049  git remote -v

 2050  git push origin hw3 

 2053  git branch --all

 2054  git branch -D remotes/origin/hw3

 2055  git push origin --delete hw3

 2056  git push origin hw3 

 2057  history