Easy Way to Add PPA Repositories in Ubuntu Linux : apt-add-repository

If you want add a ppa repository , youu need to add some lines in /etc/apt/sources.list and also need to add the GPG key. I think it not easy for beginners. Now See a simple technique to add  ppa with add-apt--repository

example :
open a terminal and add the following line for adding vala-team/ppa

$ sudo add-apt-repository ppa:vala-team/ppa