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