git clone https://github.com/ossu54/High-Performance-Computing.git
git add textfile.txt
git commit -m "added textfile"
git push origin master
git pull origin master
git clone https://github.com/ossu54/High-Performance-Computing.git
git add textfile.txt
git commit -m "added textfile"
git push origin master
git pull origin master