Add Cree languages

Incubator for crj now links w:cr:ᑳ_ᐋᐸᐦᐄᔥᑌᒡ:ᐃᔨᔨᐤ_ᐊᔨᒧᐧᐃᓐ, where a mix of Latn and Cans is used. Ethnologue seems to consider Latin as the main script. Do we really need two parallel language codes, one for each script, and who is going to translate which one?