title: github - How to fork inside a repository (Into an submodule)
body: <p>I have a repository, let's call "School's Projects".<br>
  My friend have a repository, let's call "Foo Project".<br>
  I've created a submodule inside my "School's Projects" with "Foo Project".<br>
  The thing is I want to edit "Foo Project" and create pull requests from it.<br>
  How can I do that?</p>