Adding the package LRMoE.jl

[sparktseung]

Hey, our research group has developed a package LRMoE.jl. I'd love to see it added to your repo.

Our package was originally designed for property and casualty insurance loss modelling. The package can also be applied to more general modelling problems that involve nonlinear regression and mixture model.

My only question is: should I list it under Actuarial Science (potentially under a subcategory of Property&Casualty Insurance), or maybe is Probability&Statistics -> Regression more appropriate? Or is it possible to list it under both?

Please let me know and I can make a PR. Thanks! :D