You don't need to clone the repository, you need to add remote and then add the files to the repository.
git init git remote add origin <remote_url> git fetch --all --prune git checkout master git add -A . git commit -m "Adding my files..."
In details:
You already have a remote repository and you want to add files to this repository.
First you have to "tell" git that the current directory is a git repository
git init
Then you need to tell git what is the url of the remote repository
git remote add origin <remote_url>
Now you will need to grab the content of the remote repository (all the content - branches, tags etc) git fetch --all --prune
Check out the desired branch (master in this example)
git checkout <branch>
Add the new files to the current <branch> git add -A .
Commit your changes git commit
Upload your changes back to the remote repository git push origin <branch>