fatal: remote origin already exists.

mona@DESKTOP-0JQ770H:/mnt/c/june8th_OpenARK$ git init
Reinitialized existing Git repository in /mnt/c/june8th_OpenARK/.git/
mona@DESKTOP-0JQ770H:/mnt/c/june8th_OpenARK$ git add -A
mona@DESKTOP-0JQ770H:/mnt/c/june8th_OpenARK$ git commit -m "added SR300 camera support and cleaned up the code"
On branch master
Your branch is ahead of 'origin/master' by 3 commits.
  (use "git push" to publish your local commits)

nothing to commit, working directory clean
mona@DESKTOP-0JQ770H:/mnt/c/june8th_OpenARK$ git remote add origin https://github.com/monajalal/OpenARK_PMD_RealSense.git
fatal: remote origin already exists.