How to provide a ppa for a project on Github in README?

Question

I have uploaded the source on Github but I want to provide the PPA in the README file so that users can directly do

sudo add-apt-repository -y ppa:foo/project

Then update the cache using:

sudo apt-get update

Install the package using:

sudo apt-get install project

versus making and biulding the source.

This site can be used as reference. They have provided a PPA in README.