Here are the instructions that GitHub provides you with in order to create a new repository.

Note: replace the name John Doe with your actual GitHub user name. Also replace the email and don't forget to name your app.

Global setup:

Download and install Git
  git config --global user.name "John Doe"
  git config --global user.email [email protected]
        

Next steps:

mkdir Name-Your-App
  cd Name-Your-App
  git init
  touch README
  git add README
  git commit -m 'first commit'
  git remote add origin [email protected]:BENGMN/soen490.git
  git push -u origin master
      

Existing Git Repo?

cd existing_git_repo
  git remote add origin [email protected]:BENGMN/soen490.git
  git push -u origin master

For getting the actual git repository

On windows
Download and install Git
  git config --global user.name "John Doe"
  git config --global user.email [email protected]
go to the bash emulator
cd into the folder where you want the repository
type git init
Follow this tutorial:
  http://help.github.com/win-set-up-git/
Type git remote add origin [email protected]:BENGMN/soen490.git
Type git pull origin master