add class-3-hw commands

git remote add upstream git@gitlab.com:redhat/research/mastering-git.git

git pull

git pull upstream

git pull upstream main

cd class3_homework/

git branch class3-hw

git switch class3-hw

micro 536686.txt

git add .

git status

git commit -m "added feedback for course in 536686.txt"

git push

git push --set-upstream origin class3-hw