You are trying to add a remote git that already exists. If you run the git remote -v command in the same folder as the previous commands, you will see a list of all the remote repositories that the local repository knows about. You should see two entries called heroku (one for push, one for fetch)
git remote -v
If you used the heroku create command in the same folder that added the remote git repository as alias heroku. As already mentioned, you do not need to add it again.
# create your project git init git add . git commit -m "useful commit message"
Keep expanding your code and adding / contributing it to your local git repository. When you are ready to deploy, then click on the hero.
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