add: HiTME tepmoral citation

Author: JGarnica22

README.md

@@ -12,6 +12,12 @@ Find a vignette describing its main functions in [html](https://carmonalab.githu
 remotes::install_github("carmonalab/HiTME")
 ```
 
+### How to cite HiTME
+Please note that the publication describing HiTME is currently in preparation. In the meantime, we kindly ask that you cite the two primary components of HiTME in your work:
+
+- [scGate](https://github.com/carmonalab/scGate): Andreatta, Massimo, Ariel J. Berenstein, and Santiago J. Carmona. 2022. “scGate: Marker-Based Purification of Cell Types from Heterogeneous Single-Cell RNA-Seq Datasets.” Bioinformatics 38 (April): 2642–44. https://doi.org/10.1093/BIOINFORMATICS/BTAC141.
+- [ProjecTILs](https://github.com/carmonalab/ProjecTILs): Andreatta, Massimo, Jesus Corria-Osorio, Sören Müller, Rafael Cubas, George Coukos, and Santiago J. Carmona. 2021. “Interpretation of t Cell States from Single-Cell Transcriptomics Data Using Reference Atlases.” Nature Communications 2021 12:1 12 (May): 1–19. https://doi.org/10.1038/s41467-021-23324-4.
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 # Cell type annotation