Create the project in TFS

Create a directory:  md d:\githubrepo\sitename

Navigate into directory:  cd /d d:\githubrepo\sitename

Clone the repo:  git clone http://TFSSite:8443/tfs/DefaultCollection/_git/sitename

Create files as required

Add the files into the repo:  git add .

Commit changes:  git commit

use nano (or vi / vim / notepad / vscode as required) to add comments

Push changes to master:  git push