Using github

I want to push README.md to Github.
Using Ubuntu 14.04LTS
So, I commit in the following steps.


echo "# test" >> README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/user/repo.git
git push -u origin master

But, below error occurred.


error: The requested URL returned error: 403 Forbidden while accessing https://github.com/user/repo.git/info/refs
fatal: HTTP request failed

I know solve this error this way


git remote set-url origin https://username@github.com/user/repo.git

In this way , I must enter password.


$ git push origin master
Password: 
Counting objects: 24, done.
Compressing objects: 100% (23/23), done.
Writing objects: 100% (24/24), 4.49 MiB | 618 KiB/s, done.
Total 24 (delta 2), reused 0 (delta 0)


Other resources

https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/