Open the folder
right click and select "Git Bash here"
Execute the below commands one by one
git init
git remote add origin https://Admin@dev.azure.com/BC/DEMOPROJECT/_git/DEMOPROJECT
[//Open Azure repo. click Clone , go to command line " Copy clone URL to clipboard"]
git add .
git config --global user.email "navbctech@gmail.com"
git config --global user.name "navbctech"
git commit -m "Init" //Here Init , give any comment.
git push -u origin master