git init
git remote add origin <url pro repo>
git add .
git commit -m "Commit inicial"
git push origin master

tiago@Tiago-PC MINGW64 ~/Desktop/pedidos (master)
$ git push origin master
To github.com/hostcia/useresponse.git
 ! [rejected]        master -> master (fetch first)
error: failed to push some refs to 'https://github.com/hostcia/useresponse.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.

$ git pull origin master
warning: no common commits
remote: Enumerating objects: 3, done.
remote: Counting objects: 100% (3/3), done.
remote: Total 3 (delta 0), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (3/3), done.
From github.com/hostcia/useresponse
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
fatal: refusing to merge unrelated histories

$ git push origin master
To github.com/hostcia/useresponse.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'https://github.com/hostcia/useresponse.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

$ git status
On branch master
nothing to commit, working tree clean

git add .
git commit -m "Commit inicial"
git push origin master

$ git push origin master
fatal: 'origin' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

$ git push
fatal: No configured push destination.
Either specify the URL from the command-line or configure a remote repository using

    git remote add <name> <url>

and then push using the remote name

    git push <name>