feat: Add get_current_project() API

[D7ry]

I would like to see the name of the current project on my lueline , so I added get_current_project() to the API. Under the hood, it uses get_project_root and simply uses regex to take the directory name.

A snazzy screenshot of lualine working nicely with the API:

[webmandman]

Yes, lets do this one!!

[webmandman]

@D7ry I used your code and it works good. Thank you. For now I'm using my fork from this repo.