I've just added the fit/predict api for Midas. Will be doing MidasR next when I've time. :) The change needed is basically to create a MirasR struct and re-pur

I've just added the fit/predict api for Midas. Will be doing MidasR next when I've time. :) The change needed is basically to create a MirasR struct and re-purpose the MidasR function into fit and predict.