Создайте новый репозиторий в командной строке на GitHub

echo "# Athentification_Flutter-Login-Register-" >> README.md
git init
git add README.md
git commit -m "first commit"
git branch -M main
git remote add origin https://github.com/israa790/Athentification_Flutter-Login-Register-.git
git push -u origin main
Wild Bat