[OTHER] Add a GitHub Actions workflow to generate `DIRECTORY.md`

[Panquesito7]

What would you like to share?

To make the algorithm addition process easier, we can make a GitHub Actions workflow to generate a DIRECTORY.md file.
Many repositories in the organization do this to keep things organized. We can use the workflow from the C++ repository.

What do you think? Thanks. 🙂

Additional information

I'd like to work on this. 🙂

[raklaptudirm]

We already maintain a list of algorithms in our README.md.