Git

GitHub: visit edit-participants and fork the project.
git clone git@github.com:cm-demo/participants.git
git branch add-myself
git checkout add-myself
edit the participants.json file
git status
git diff
git add participants.json
git commit -m "some excuse"
git push
git push --set-upstream origin add-myself
GitHub: Send Pull-Request

gitk --all
git pull
git remote
git rebase