Thank you for your interest in this project.
Recall that the short description gives ideas for the project and you, the potential contributor, are expected to turn the ideas into a full proposal.
To get the current state of implementation, you can look at the code of the graph module. You will find methods for the enumeration of simple paths, the k shortest simple paths, cycles, etc.
For algorithms, you can read for instance recent papers on the k shortest simple paths like
Sincerely,
David.