Add clustifyr package?

[agillen]

clustifyr is an RBI-authored packaged that classifies cells and clusters in single-cell RNA sequencing experiments using reference bulk RNA-seq data sets, sorted microarray expression data, single-cell gene signatures, or lists of marker genes.

Repo: https://github.com/rnabioco/clustifyr
Publication: https://f1000research.com/articles/9-223/v2