How to put several repositories under one domain?

I have two repositories under a free organisation on github: my_organisation/first and my_organisation/second.

And I want to do the magic the way the first repository is available on my_organisation.github.io/first and the second is available on my_organisation.github.io/second.

Is it possible? If so, then how can I do it?

>Solution :

Yes, it is possible and if you have gh-pages enabled it will happen by default. If not Here are the steps you can follow:

1. Go to the Settings tab of each repository on GitHub and scroll down to the "GitHub Pages" section, might also be available on the left sidebar as "Pages"
2. Under the "Source" section, select the branch as the source for your GitHub Pages site.
3. Save your changes.
4. Wait a few minutes for GitHub to build your site.
   Your repositories should now be available at the following URLs:
   my_organisation.github.io/first
   my_organisation.github.io/second