PR-exercise

Steps:

1. Fork from https://github.com/itc-workshop/PR-exercise.
2. Use git clone to clone the repository you forked.
3. Go to the folder of the repo you have cloned. (most people forgot this step!!)
4. Add a new txt file with your username as the file name and type your full name inside the file.
5. Commit and push to your remote repository.
6. Pull request to the original repository.