Add to conda-forge to allow installation with conda?

[wmayner]

First, thank you for your work on this package! 😁

It would be wonderful if Graphillion were available for installing through conda. There is a guide for adding packages to conda-forge here.

For context: I am the maintainer of the PyPhi library, which depends on Graphillion's ZDD implementation of efficient set family operations. I would like to distribute the latest version of PyPhi on conda, but to do that, all dependencies need to also be available on conda.