Add new option to create a GitHub repository during init

It would be a handy feature to be able to create a repository on github from the CLI directly as a new option when doing `aio app init` e.g `Would you like to create a repository on GitHub ?` or something like that.
By doing that, I can imagine that it would be possible to set the secrets using the GitHub API for CI/CD during the same process so that users don't have to do it manually.

That's an opportunity to kill two birds with one stone as you might say.