There are two ways to create a new online repository in GitHub¹⁾:

• Create online and clone to PC
• Create on PC and push to git

The first approach is simpler as it requires less work and commands to accomplish a working repository.

• Create a new²⁾ repository on GitHub
  • Add a readme
  • Add a license
  • Add a gitignore
• Click the green “Clone or Download” button and copy the new Git URL.
• Open a command prompt on the PC with the git installed and in the path
• Change to the directory where the repository should be cloned into
• Issue the git command 'git clone “<URL>”' where <URL> is the the link copied in the step above.

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